Initial implementation of b4 submit

This is the first rough implementation of "b4 submit". Currently
implemented:

- b4 submit --new : to start a new branch
- b4 submit --edit-cover : to edit the cover message
- b4 submit --update-trailers : to receive latest trailer updates from
                                the mailing lists
- b4 submit --send : sends the messages using existing git.sendemail
                     configs

For details, see "b4 submit --help".

Signed-off-by: Konstantin Ryabitsev <konstantin@linuxfoundation.org>

1 files changed, 0 insertions, 0 deletions

diff --git a/patatt b/patatt
-Subproject d1279c4ca7f29b6f98d784c7bf053c3b2ff1157
+Subproject 0eb41be65707a1e156a59fd25ea9824c1a9e95c