Updated openstack/openstack
Project: openstack/ceilometer  97748958b646e16acf08ee0a03b24caa322972ce

Skipping central agent pollster when keystone not available

When keystone is not available, instead of skipping all central agent
pollsters, we should let the pollsters decide whether to skip or not,
because not all central agent pollsters requires keystone.

Closes-Bug: #1316532

Change-Id: Ib34f9838bd128e1b357937f0c177d8a09f19b13f