git-push: send "To <remoteurl>" messages to the standard output in --porcelain mode

git-push prints the line "To <remoteurl>" before above each of the ref status lines. In --porcelain mode, these "To <remoteurl>" lines go to the standard error, but the ref status lines go to the standard output. This makes it difficult for the process reading standard output to know which ref status lines correspond to which remote. This patch sends the "To <remoteurl>" lines to the the standard output instead. Signed-off-by: Larry D'Anna <larry@elder-gods.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>