Allow an option to control the minimum percentage of sign-offs required
before being considered a maintainer.

git-min-percent has a default value of 5
Signed-off-by: NJoe Perches <joe@perches.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>