Switch Ironic role repo to use git.o.o
Switch Ironic role repo to use git.o.o

Now that the Ironic role repository has been renamed to
openstack-ansible-os_ironic we can switch the role-requirements
to use git.openstack.org as a source.

Change-Id: I546f29effc7f16d41817f89741c9536d8a036fe2

robb-romans/openstack-ansible,mancdaz/openstack-ansible,os-cloud/os-ansible-deployment,stackforge/os-ansible-deployment,Logan2211/openstack-ansible,BjoernT/os-ansible-deployment,bunchc/openstack-ansible,robb-romans/openstack-ansible,yanyao/newton,openstack/openstack-ansible,weezer/openstack-ansible,cfarquhar/openstack-ansible,mancdaz/openstack-ansible,cloudnull/os-ansible-deployment,bunchc/openstack-ansible,Logan2211/openstack-ansible,BjoernT/openstack-ansible,os-cloud/os-ansible-deployment,BjoernT/os-ansible-deployment,stackforge/os-ansible-deployment,yanyao/newton,BjoernT/openstack-ansible,yanyao/openstack-ansible,cfarquhar/openstack-ansible,yanyao/openstack-ansible,cloudnull/os-ansible-deployment,weezer/openstack-ansible,openstack/openstack-ansible,BjoernT/os-ansible-deployment