Add VXLAN example to ovs_neutron_plugin.ini

Change-Id: I512bc206f051b58ed346e1fc5247d692ba9bdba3
Remove FWaaS Noop driver as default and move to unit tests dir

Remove the FWaaS Noop driver as the default and raise an exception
when the fwaas_driver.ini file has an enabled flag without any
associated driver. This communicates a misconfiguration clearly.
The Noop driver is moved to unit tests where it is used.
Also some cleanups in related area.

Closes-Bug: #1250841

Change-Id: Ib6345923df05994ceffc0b1cbf265b53c23e97f1
Fix extension description and remove unused exception

Change-Id: Id0a40a8decb46e306256196c7fc79d687d4f8075
Closes-Bug: #1267841
Remove extra whitespace

Remove an extra whitespace in the __str__ routine for the
VifPort class

Change-Id: Ie4a7d011af1697d2e6f523dfe00244aaa42d5127
Merge "Add VXLAN example to ovs_neutron_plugin.ini"
Merge "Remove extra whitespace"
Merge "Fix extension description and remove unused exception"
Merge "Remove FWaaS Noop driver as default and move to unit tests dir"