Pete Wyckoff authored Jan 21, 2014 and Junio C Hamano committed Jan 22, 2014

The tests use author@example.com as the canonical submitter,
but he does not have an entry in the p4 users database.
This causes the generated change description to complain
that the git and p4 users disagree.  The complaint message
is still valid, but isn't useful in tests.  It was introduced
in 848de9c3 (git-p4: warn if git authorship won't be retained,
2011-05-13).

Fix t9813 to use @example.com instead of @localhost

 due to
change in p4_add_user().  Move the function into the git p4
test library so author can be added at initialization time.

Signed-off-by: Pete Wyckoff <pw@padd.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>