grep: don't support "grep.color"-like config options
grep: don't support "grep.color"-like config options

color.grep and color.grep.* is the official and documented way to
highlight grep matches. Comparable options like diff.color.* and
status.color.* exist for backward compatibility reasons only and are not
documented any more.

Signed-off-by: Markus Heidelberg <0d81b087f526a5f04c6f63e0d7d37e8fa6992df4@web.de>
Signed-off-by: Junio C Hamano <a6723cc3f76163bf7adb636a73ac3b0ceb3e6b9b@pobox.com>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git