change the type of ntp_server
change the type of ntp_server

change the type of ntp_server from ip to general so that can use domain name

Change-Id: Id5b1b7050f2d0dc755bccf0126f17a7abe864b9e
Signed-off-by: baigk <ed83f4c53af87f7e4ded417290982537b7a6d262@huawei.com>

openstack/compass-core,stackforge/compass-core,stackforge/compass-core,stackforge/compass-core,openstack/compass-core,openstack/compass-core,openstack/compass-core,stackforge/compass-core