source_type is not assigned, regardless of virtual environment

- [x] I am on the [latest](https://github.com/python-poetry/poetry/releases/latest) Poetry version.
- [x] I have searched the [issues](https://github.com/python-poetry/poetry/issues) of this repo and believe that this is not a duplicate.
- [x] If an exception occurs when executing a command, I executed it again in debug mode (`-vvv` option).



- **OS version and name**: Fedora 31
- **Poetry version**: 1.1.0a1

## Issue

### Summary

Inside of a `conda` environment or a `virtualenv`, packages are discovered, but are not assigned a `source_type` attribute.

### To reproduce the issue with `conda`:

1. Create a new `conda` environment, for example `conda create --name poetry-fail-env python=3.7`. Note I'm using the most recent release of `conda` which is 4.8.3
2. Activate the environment, `conda activate poetry-fail-env`
3. Make the poetry project `poetry new poetry-fail-proj`
4. Inside `poetry-fail-proj` run `poetry install`

Note that already packages are being updated despite being the most recent version:
```
Updating dependencies
Resolving dependencies... (0.2s)

Writing lock file


Package operations: 0 installs, 11 updates, 0 removals

  - Updating zipp (3.1.0 /home/sean/.conda/envs/poetry-fail/lib/python3.7/site-packages -> 3.1.0)
  - Updating importlib-metadata (1.6.0 /home/sean/.conda/envs/poetry-fail/lib/python3.7/site-packages -> 1.6.0)
  - Updating pyparsing (2.4.7 /home/sean/.conda/envs/poetry-fail/lib/python3.7/site-packages -> 2.4.7)
  - Updating six (1.14.0 /home/sean/.conda/envs/poetry-fail/lib/python3.7/site-packages -> 1.14.0)
  - Updating attrs (19.3.0 /home/sean/.conda/envs/poetry-fail/lib/python3.7/site-packages -> 19.3.0)
  - Updating more-itertools (8.2.0 /home/sean/.conda/envs/poetry-fail/lib/python3.7/site-packages -> 8.2.0)
  - Updating packaging (20.3 /home/sean/.conda/envs/poetry-fail/lib/python3.7/site-packages -> 20.3)
  - Updating pluggy (0.13.1 /home/sean/.conda/envs/poetry-fail/lib/python3.7/site-packages -> 0.13.1)
  - Updating py (1.8.1 /home/sean/.conda/envs/poetry-fail/lib/python3.7/site-packages -> 1.8.1)
  - Updating wcwidth (0.1.9 /home/sean/.conda/envs/poetry-fail/lib/python3.7/site-packages -> 0.1.9)
  - Updating pytest (5.4.1 /home/sean/.conda/envs/poetry-fail/lib/python3.7/site-packages -> 5.4.1)
  - Installing poetry-fail-proj (0.1.0)
```

5. Run `poetry update --dry-run`

The packages are still marked for update:
```
Updating dependencies
Resolving dependencies... (0.2s)


Package operations: 0 installs, 11 updates, 0 removals, 2 skipped

  - Updating zipp (3.1.0 /home/sean/.conda/envs/poetry-fail/lib/python3.7/site-packages -> 3.1.0)
  - Updating importlib-metadata (1.6.0 /home/sean/.conda/envs/poetry-fail/lib/python3.7/site-packages -> 1.6.0)
  - Updating pyparsing (2.4.7 /home/sean/.conda/envs/poetry-fail/lib/python3.7/site-packages -> 2.4.7)
  - Updating six (1.14.0 /home/sean/.conda/envs/poetry-fail/lib/python3.7/site-packages -> 1.14.0)
  - Skipping atomicwrites (1.3.0) Not needed for the current environment
  - Updating attrs (19.3.0 /home/sean/.conda/envs/poetry-fail/lib/python3.7/site-packages -> 19.3.0)
  - Skipping colorama (0.4.3) Not needed for the current environment
  - Updating more-itertools (8.2.0 /home/sean/.conda/envs/poetry-fail/lib/python3.7/site-packages -> 8.2.0)
  - Updating packaging (20.3 /home/sean/.conda/envs/poetry-fail/lib/python3.7/site-packages -> 20.3)
  - Updating pluggy (0.13.1 /home/sean/.conda/envs/poetry-fail/lib/python3.7/site-packages -> 0.13.1)
  - Updating py (1.8.1 /home/sean/.conda/envs/poetry-fail/lib/python3.7/site-packages -> 1.8.1)
  - Updating wcwidth (0.1.9 /home/sean/.conda/envs/poetry-fail/lib/python3.7/site-packages -> 0.1.9)
  - Updating pytest (5.4.1 /home/sean/.conda/envs/poetry-fail/lib/python3.7/site-packages -> 5.4.1)
```

Poetry debug info:
```
Poetry
Version: 1.1.0a1
Python:  3.7.6

Virtualenv
Python:         3.7.6
Implementation: CPython
Path:           /home/sean/.conda/envs/poetry-fail
Valid:          True

System
Platform: linux
OS:       posix
Python:   /home/sean/.conda/envs/poetry-fail
```

### To reproduce the issue with `virtualenv`:

Same process as `conda` but use `virtualenv` instead.

4. `poetry install`

```
Installing dependencies from lock file


Package operations: 11 installs, 0 updates, 0 removals

  - Installing zipp (3.1.0)
  - Installing importlib-metadata (1.6.0)
  - Installing pyparsing (2.4.7)
  - Installing six (1.14.0)
  - Installing attrs (19.3.0)
  - Installing more-itertools (8.2.0)
  - Installing packaging (20.3)
  - Installing pluggy (0.13.1)
  - Installing py (1.8.1)
  - Installing wcwidth (0.1.9)
  - Installing pytest (5.4.1)
  - Installing poetry-fail-proj (0.1.0)
```

5. `poetry update --dry run`

```
Updating dependencies
Resolving dependencies... (0.6s)


Package operations: 0 installs, 11 updates, 0 removals, 2 skipped

  - Updating zipp (3.1.0 /home/sean/.virtualenvs/poetry-test/lib/python3.7/site-packages -> 3.1.0)
  - Updating importlib-metadata (1.6.0 /home/sean/.virtualenvs/poetry-test/lib/python3.7/site-packages -> 1.6.0)
  - Updating pyparsing (2.4.7 /home/sean/.virtualenvs/poetry-test/lib/python3.7/site-packages -> 2.4.7)
  - Updating six (1.14.0 /home/sean/.virtualenvs/poetry-test/lib/python3.7/site-packages -> 1.14.0)
  - Skipping atomicwrites (1.3.0) Not needed for the current environment
  - Updating attrs (19.3.0 /home/sean/.virtualenvs/poetry-test/lib/python3.7/site-packages -> 19.3.0)
  - Skipping colorama (0.4.3) Not needed for the current environment
  - Updating more-itertools (8.2.0 /home/sean/.virtualenvs/poetry-test/lib/python3.7/site-packages -> 8.2.0)
  - Updating packaging (20.3 /home/sean/.virtualenvs/poetry-test/lib/python3.7/site-packages -> 20.3)
  - Updating pluggy (0.13.1 /home/sean/.virtualenvs/poetry-test/lib/python3.7/site-packages -> 0.13.1)
  - Updating py (1.8.1 /home/sean/.virtualenvs/poetry-test/lib/python3.7/site-packages -> 1.8.1)
  - Updating wcwidth (0.1.9 /home/sean/.virtualenvs/poetry-test/lib/python3.7/site-packages -> 0.1.9)
  - Updating pytest (5.4.1 /home/sean/.virtualenvs/poetry-test/lib/python3.7/site-packages -> 5.4.1)
```

Poetry debug info:
```
Poetry
Version: 1.1.0a1
Python:  3.7.6

Virtualenv
Python:         3.7.6
Implementation: CPython
Path:           /home/sean/.virtualenvs/poetry-test
Valid:          True

System
Platform: linux
OS:       posix
Python:   /usr
```

### Investigation

Digging through the code, I found these line was triggering the updates:
```
                    elif package.source_type != pkg.source_type:
                        operations.append(Update(pkg, package))
```

where `package.source_type` is an empty string, but `pkg.source_type` is `directory`.

I'm not sure why the solver never assigns a value to `source_type`, but am happy to debug further asynchronously or via a video chat.

Unlike #1612, reverting to `poetry 1.0.0` does not solve this problem.

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source_type is not assigned, regardless of virtual environment #2281

Issue

Summary

To reproduce the issue with `conda`:

To reproduce the issue with `virtualenv`:

Investigation

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