Use permissions attribute to detect ironic service
Use permissions attribute to detect ironic service

Horizon implements a logic to enable/disable panel by permissions
defined in each panel class. This change replaces the current redundant
logic by that built-in feature to simplify how we define requirements
of the Ironic panels.

Change-Id: I4a9dabfea79c23155fb8986fe8386202d7474485

openstack/ironic-ui,openstack/ironic-ui,openstack/ironic-ui,openstack/ironic-ui