Add device role tagging functionality to openstack connector. All interfaces are...

Add device role tagging functionality to openstack connector. All interfaces are tagged with the name of the VDU interface in the OSM descriptor. To be able to use 'device role tagging' functionality define 'microversion: 2.32' in datacenter config. This implementation approach is due to the warning message in https://developer.openstack.org/api-guide/compute/microversions.html where it is stated that microversion backwards compatibility is not guaranteed and clients should always require an specific microversion.

Change-Id: I75c572291fe648467c69b4958b8b3e58ecec178c
Signed-off-by: montesmoreno <pablo.montesmoreno@telefonica.com>