This change creates new group membership items so that we can
do selective git clones and wheel building based on defined
groups.
It also itemises the global-requirements-pins to ensure that they can
be used to update upper-constraints.
Needed-By: Idda16b4f382eee57c7469af898859d6d81d4eb30
Needed-By: I6e5a554d6f87058ef5cb63adf7995b066cb6fd78
Needed-By: I6a0508e8aaa4993bc68e72e3d2988d6db6470f6d
Change-Id: I6a0508e8aaa4993bc68e72e3d2988d6db6470f6d
Signed-off-by: Kevin Carter <kevin.carter@rackspace.com>
3ec922c2ed