Process stats from ElasticSearch matched by IP
Process stats from ElasticSearch matched by IP

In some scenarios ElasticSearch returns its IP address
as 'host' value. This was filtered out when looking for
matching hostname. This commit adds IP address to
allowed 'hostnames'

Change-Id: I3fd1adf291c2eead0c8c601140a5e4b1487ba9a4

sapcc/monasca-agent,sapcc/monasca-agent,sapcc/monasca-agent