[devstack]Remove unneeded enable_service in example.local.conf
[devstack]Remove unneeded enable_service in example.local.conf

As we use enable_plugin for ironic, there's no need to enalbe ironic
related services again.

Change-Id: Iaf7e37b0a3c1d2c7883dddb44c31ee40f07e5b03

openstack/ironic-inspector,openstack/ironic-inspector