Currently the installation of ARA does not apply
the same pip options (including constraints, proxy
settings, etc) as the ansible bootstrap. This may
result in unexpected side-effects.
To ensure that we're keeping things consistent, we
apply the same pip options as those used for the
Ansible bootstrap.
Backport note:
We include the os_rally role requirement to ensure
that the repo build is able to complete.
Depends-On: https://review.openstack.org/570929
Change-Id: I5f20a130032e1b65dc78828344345515975da4dc
(cherry picked from commit f4e8e7f82a)