Make neutron.common.log.log print module path

Closes-Bug: #1221663

neutron.common.log.log is useful for logging arguments of a method.
It outputs class name and method name, but module path is not output.
A module path is useful to search the log message.

Change-Id: Ic2903da750cc13980d5cdee153bb079f7d4ee122
Merge "Make neutron.common.log.log print module path"