Use test_lazy_prereq to setup prerequisites for the p4 move
test. This both makes the test simpler and clearer, and also
means it no longer fails the new --chain-lint tests.
Suggested-by: Jeff King <peff@peff.net> Signed-off-by: Luke Diamand <luke@diamand.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>