Update ceph repo
Update ceph repo

Ceph repo has been moved to download.ceph.org[0].
And actually "http://www.ceph.com/debian-hammer" returns http 301 code now.

[0] http://docs.ceph.com/docs/master/install/get-packages/#add-ceph

TrivalFix

Change-Id: I74d6ecf97fcc991509850db55c357f4105587af0

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