avoid negative variables

Trying to use booleans with names like "no_xxx" are hard to follow due
to the double negatives.  Invert all of them so we only have positive
meanings to follow.

Change-Id: Ifd37d0368f97034d94aa2cf38db52c723ac0c6ed
Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/255493


Tested-by: Mike Frysinger <vapier@google.com>
Reviewed-by: David Pursehouse <dpursehouse@collab.net>