This change drops check on UUID validness from our API.
It also has a subtle effect of doing Ironic node fetching in
the introspection status and data fetch calls, which might make them
slightly longer (but only when name is used).
A new helper common.ironic.get_node is created to unify how we fetch nodes
from Ironic. It also provides nicer exceptions.
Change-Id: I20cf65e57910568b70a62c3f9269a962e78a07e2
Closes-Bug: #1523902