Merge branch 'bk/p4-pre-edit-changelist'

Merge branch 'bk/p4-pre-edit-changelist'

"git p4" learned four new hooks and also "--no-verify" option to
bypass them (and the existing "p4-pre-submit" hook).

* bk/p4-pre-edit-changelist:
  git-p4: add RCS keyword status message
  git-p4: add p4 submit hooks
  git-p4: restructure code in submit
  git-p4: add --no-verify option
  git-p4: add p4-pre-submit exit text
  git-p4: create new function run_git_hook
  git-p4: rewrite prompt to be Windows compatible