Novajoin is a new nova metadata micro-service that registers
instances created by nova with a FreeIPA server, so that we can
take advantage of server/service identities, kerberos credentials,
access and sudo controls etc.
The included modules will cause the undercloud to be registered with
a FreeIPA server, for novajoin to be installed, and for nova on the
undercloud to be configured to use novajoin.
Change-Id: I2e1c18a0174f70dc6e9c1d402caac574e6c81678
Implements: blueprint novajoin
267d9b1fcb