python-git is needed by buildhistory-diff, so add it to this
packagegroup allowing buildhistory-diff to be used within
build-appliance-image.
(From OE-Core rev: 1f2d0f898e11bbb935d885920a1518336e19c3e7)
Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>