It used to be an optimization for single-process Ironics with RPC
enabled. Unfortunately, this approach won't work after the migration
from eventlet.
I don't expect this change to be user-visible, although purely
theoretically there may be edge cases with misconfigured RPC that get
broken.
Change-Id: If4be34178f920ab6b2f6318b15a490672bd6ec3d
Signed-off-by: Dmitry Tantsur <dtantsur@protonmail.com>