push: teach --quiet to suppress "Everything up-to-date"
push: teach --quiet to suppress "Everything up-to-date"

This should have been part of 481c7a6, whose goal was to
make "git push -q" silent unless there is an error.

Signed-off-by: Jeff King <696e3fbcf235d40b6ea1ebd61c87cbea79d444e7@peff.net>
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