The default MSP implementation can be found in mspimpl.go.
The file is gigantic and it is getting complex to modify it.
In order to simply the picture, mspimpl.go will be split
in multiple files:
- mspimplsetup.go to handle the setup related functions
- mspimplvalidate.go to handle the validation related functions

No new code has been introduced, therefore no tests
have been added.

This change-set is propaedeutic to the implementation
of FAB-5668

Change-Id: I9b851bf919e185d79f59b66be11e40e9822033f7
Signed-off-by: Angelo De Caro <adc@zurich.ibm.com>