Implemented option to disable port-security for openstack. Implemented option...

Implemented option to disable port-security for openstack. Implemented option to specify floating_ip in openstack. Solved 2 bugs in floating_ip implementation for Openstack

Change-Id: I1d6463f9743924dacd93d522f625ecef34b0decf
Signed-off-by: montesmoreno <pablo.montesmoreno@telefonica.com>