Modulefile rpm build restructuring.

Adopt/adapt Rocks approach to copying version from corresponding s/w package.
Move all variant definitions into version.mk so that identical modulefile
Makefile will work across rolls.
Use canonical modulefile/roll-test build files.
Merge branch 'master' of https://forge.sdsc.edu/stash/scm/aps/mpi-roll

Conflicts:
	src/mpi-modules/version.mk
	src/roll-test/version.mk