Add NtpServer support to cover for OSP13 NTPd configuration
Add NtpServer support to cover for OSP13 NTPd configuration

Also adds MinPoll and MaxPoll to diminish the intervals which NTPd
will obeys to when syncing with remote pools.

Change-Id: Iaa48ba1a3409aa3a425c05d41f5067e517c48577

redhat-openstack/infrared,redhat-openstack/infrared,redhat-openstack/infrared