MFC: Pad the strings sccs[], version[], and osrelease[], and add a BRANCH_OVERRIDE environment variable (which, if set, overrides the BRANCH specified here).  These make my FreeBSD Update build code simpler by making it easier to recognize when two kernels are identical modulo version numbers.
MFC: Pad the strings sccs[], version[], and osrelease[], and add a
BRANCH_OVERRIDE environment variable (which, if set, overrides the
BRANCH specified here).  These make my FreeBSD Update build code
simpler by making it easier to recognize when two kernels are identical
modulo version numbers.

Approved by:	re (kensmith)

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