CP-5096: Add MAINTAINERS etc. files
Merge pull request #1 from tmakatos/CP-5096

CP-5096: Add MAINTAINERS etc. files
CP-4731: build using the git sm repo

This patch fixes the build system to use the git based sm repository
instead of the mercurial one.
Merge pull request #2 from tmakatos/CP-4731

CP-4731: build using the git sm repo