Remove restarting openstack-keystone when update master node
Remove restarting openstack-keystone when update master node

Keystone service is run as wsgi service behind Apache Httpd
in Newton. So, we don't need to restart it, but instead we
can restart httpd service.

Change-Id: Ib3861cf6a57f6c6850b66162cbd29535e93f8da1
Closes-Bug: #1622355

stackforge/fuel-library,stackforge/fuel-library,stackforge/fuel-library,stackforge/fuel-library