Honor the shared config in the default session (gruntwork-io#1663)

Fix gruntwork-io#1650: Make sure credentials for STS get caller ident…

…ity uses the configuration parameters (gruntwork-io#1654)

* Fix gruntwork-io#1650

* Update function docs to clarify what is going on

Update to Terraform 0.15 (gruntwork-io#1651)

* Update build to use TF 0.15

* Update compatibility table

* Fix help text unit test

* Fix tests

- Remove `TestTerragruntHonorsS3RemoteStateSkipFlagsRegression` because it relies on switching from local Terraform state to remote state, but with Terraform 0.15, that requires an interactive prompt (asking if you want to move your state) that does not work well in an automated test.
- Fix `TestTerragruntSetsAccessLoggingForTfSTateS3BuckeToADifferentBucketWithGiven` and `TestTerragruntSetsAccessLoggingForTfSTateS3BuckeToADifferentBucketWithDefau` to not rely on the state moving aspects. Those don't seem relevant for those test cases and were probably just copy/pasted in.

Only check if versioning is enabled on GCS bucket when skip_bucket_ve…

…rsioning is false (gruntwork-io#1610)

Remove `init` from TERRAFORM_COMMANDS_NEED_LOCKING (gruntwork-io#1642)

`terraform init` does not support locking
resolves gruntwork-io#1641

Added vault support for sops encryption mechanism (gruntwork-io#1564)

* Bumped sops version, added dependency

* Updated documentation

* Updated autogenerated go.sum

* Bumped sops version, added dependency

* Updated documentation

* Updated autogenerated go.sum

* Bumped vault to 1.7.0 and sops to 3.7.0

* Added required go.sum entry

* Ran `go mod tidy`

* Fixed indirect dependicies for vault

* Fixed whitespace issue

Co-authored-by: Eldar Karazhas <karazhas.e@n-t.io>

Allow generate and remote_state to be set as attrs (gruntwork-io#1639)

* Allow generate and remote_state to be set as attrs

This allows us to configure code generation and remote state dynamically. See the documentation updates for examples.

* Run go fmt

* Fix copy/pasted variable name

* Use native remote_state and generate blocks in common.hcl

Fixing behavior of `--terragrunt-strict-include` when no `--terragrun…

…t-include-dir` flags are included (gruntwork-io#1631)

* adding tests for Terragrunt include

* adding potential fix, still need to run tests

* fixing syntax error

* fixing syntax for building of Terragrunt command

* updating `--terragrunt-strict-include` documentation for new behavior

* adding in missing word

Co-authored-by: Christopher Busby <chris@controlant.com>

Add configurable retries (gruntwork-io#1632)

* add configurable retry attempts and sleep interval

* preface retry-related options with 'retry'

* address PR comments

Co-authored-by: Andrey Kaipov <andreykaipov@users.noreply.github.com>

Fix validate-inputs to support null defaults (gruntwork-io#1613)