Do not source old/localrc twise in grenade
Do not source old/localrc twise in grenade

By sourcing localrc second time we try to enable ironic plugin
one more time witch is not allowed by [0]

This patch checks if ironic was enabled or not in base environment
without sourcing localrc.

[0] https://review.openstack.org/#/c/396794/

Change-Id: I432c243c66c0d11adcf4c6568968fbeaaf9acdcd

openstack/ironic-inspector,openstack/ironic-inspector