Functional tests job are broken. This change proposes add post
test hook in ironicclient, which will be executed inside
post_test_hook function in devstack gate.
The benefit from this approach is it will immediately pick up
proposed fixes on ironicclient side and runs job. It allows us
to see the change breaks tests or not w/o merging related
changes.
post_test_hook runs functional tests and generate testr results
(original implementation was stolen from novaclient).
Closes-Bug: #1491778
Change-Id: Id476430d01a57a83bd4ee42b2d03e681835dfec3
156ca47f92