Change statsd_host config type
Change statsd_host config type

Change oslo config to support valid IP addresses and valid
host domain names for statsd host.

Change-Id: I4f9a136f2183be8adfd1456e0e65da17e461cf56
Story: 2002596
Task: 22207

openstack/monasca-log-api,stackforge/monasca-log-api,openstack/monasca-log-api,stackforge/monasca-log-api,stackforge/monasca-log-api,openstack/monasca-log-api