Addition of a non-voting bifrost integration test that exercises
the code path utilized for image builds while building a diskimage-
builder based IPA image, along with a guest image to be booted,
which should draw it's network configuration via simple-init/glean.
This ultimately allows for an integrated test of:
* bifrost
* diskimage-builder
* ironic
* ironic-python-agent
* python-ironicclient
* shade
* simple-init/glean
Change-Id: Id9b4888fb20d5af163f14fe1f9136913f95a8a5f
397c48b947