n-net: turn down log level when vif isn't found in deallocate_fixed_ip
n-net: turn down log level when vif isn't found in deallocate_fixed_ip

Logstash shows that within 7 days this error shows up over 16,000 times
and 85% of those jobs are successful.

http://goo.gl/mz8ocj

Given bug 968457 was reported in 2012 and nothing has been adjusted
since to address this race, we can assume it's not an error condition
that justifies the ERROR log level, so let's tone it down to INFO.

Related-Bug: #968457

Change-Id: I050a8915349da39530433edaba49c1e781e6d692

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