Factor out common code into test_pull_autostash_fail() and then call it in
these tests.
Helped-by: Eric Sunshine <sunshine@sunshineco.com> Signed-off-by: Mehul Jain <mehul.jain2029@gmail.com> Reviewed-by: Eric Sunshine <sunshine@sunshineco.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>