push test: simplify check of push result

This test checks each ref with code like the following:

	r=$(git show-ref -s --verify refs/$ref) &&
	test "z$r" = "z$the_first_commit"

Afterward it counts refs:

	test 1 = $(git for-each-ref refs/remotes/origin | wc -l)

Simpler to test the number and values of relevant refs in for-each-ref
output at the same time using test_cmp.  This makes the test more
readable and provides more helpful "./t5516-push-push.sh -v" output
when the test fails.

Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

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