Add a --shelve command line argument which invokes p4 shelve instead
of submitting changes. After shelving the changes are reverted from the
p4 workspace.
Signed-off-by: NVinicius Kursancew <viniciusalexandre@gmail.com>
Reviewed-by: NLuke Diamand <luke@diamand.org>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>