Sets DEFAULT_INSTANCE_TYPE in localrc for Ironic

Set DEFAULT_INSTANCE_TYPE=baremetal for Ironic so lib/tempest
pulls the correct flavor_ref during Tempest configuration.

Change-Id: Ie5c649c7d6dd145559d2ca7948e77bbdee4e6a37
Merge "Sets DEFAULT_INSTANCE_TYPE in localrc for Ironic"