Merge branch 'ld/push-porcelain'

* ld/push-porcelain: t5516: Use test_cmp when appropriate git-push: add tests for git push --porcelain git-push: make git push --porcelain print "Done" git-push: send "To <remoteurl>" messages to the standard output in --porcelain mode git-push: fix an advice message so it goes to stderr Conflicts: transport.c