Pass correct 'security_groups' value for port operations

Make sure pass the correct value of 'security_groups'
property to neutronClient for OS::Neutron::Port resource
operations.

Change-Id: I84fa2c149c18b0b85be7cf1ff5a8ab2641a5c276
Closes-bug: #1369933
Merge "Pass correct 'security_groups' value for port operations"