Addition of an inspection role, the appropriate test and enrollment
playbooks, and an entry for the node inspection to take place as
part of the long running non-voting job for initial testing.
Implements: blueprint bifrost-inspector-support
Depends-On: I4ba3f0cf4ad6f5466e52f5d034bb217f06eec7dd
Change-Id: Iceaf96aaeedc99530fabe2af47bab414d689c3dd