git p4: test clean-up after failed submit, fix added files

Test a variety of cases where a patch failed to apply to
p4 and had to be cleaned up.

If the patch failed to apply cleanly, do not try to remove
to-be-added files, as they have not really been added yet.

Signed-off-by: Pete Wyckoff <pw@padd.com>
Acked-by: Luke Diamand <luke@diamand.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

git-p4.py

@@ -1200,8 +1200,6 @@ class P4Submit(Command, P4UserMap):
         if not patch_succeeded:
             for f in editedFiles:
                 p4_revert(f)
-            for f in filesToAdd:
-                os.remove(f)
             return False
 
         system(applyPatchCmd)