[PATCHv2] git-p4: Handle p4 submit failure

This is a small reroll of Etienne's earlier patch to clean up the p4 repo on submit failure.

The only difference is to fix the t9807- test. This test was trying to remove a file which had already been cleaned up as a result of this change.

GIRARD Etienne (1):
  git-p4: clean up after p4 submit failure

 git-p4.py                | 71 +++++++++++++++++++++++++-----------------------
 t/t9807-git-p4-submit.sh |  2 +-
 2 files changed, 38 insertions(+), 35 deletions(-)