[2.1] please cleanup log format for new interface monitoring state

[LaMont Jones]

When rackd starts, it generates a log entry that looks like the below. It should not look like an error log.

2016-09-30 17:33:12 [ClusterClient,client] New interface monitoring state:
        {'eth0': {'active': False, 'mdns': False, 'neighbour': False, 'params': None},
         'eth1': {'active': False, 'mdns': False, 'neighbour': False, 'params': None},
         'eth2': {'active': False, 'mdns': False, 'neighbour': False, 'params': None},
         'eth3': {'active': False, 'mdns': False, 'neighbour': False, 'params': None},
         'eth4': {'active': False, 'mdns': False, 'neighbour': False, 'params': None},
         'eth5': {'active': False, 'mdns': False, 'neighbour': False, 'params': None}}