t5505: 'remote add x y' should work when url.y.insteadOf = x

This is the test missing from fb86e32d (git remote: allow adding
remotes agreeing with url.<...>.insteadOf, 2014-12-23): we should
allow adding a remote with the URL when it agrees with the
url.<...>.insteadOf setting.
Signed-off-by: NJohannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

t/t5505-remote.sh

@@ -51,6 +51,11 @@ test_expect_success setup '
 	git clone one test
 '
 
+test_expect_success 'add remote whose URL agrees with url.<...>.insteadOf' '
+	test_config url.git@host.com:team/repo.git.insteadOf myremote &&
+	git remote add myremote git@host.com:team/repo.git
+'
+
 test_expect_success C_LOCALE_OUTPUT 'remote information for the origin' '
 	(
 		cd test &&