It's been experimental for some time. The project struggles with a
matrix of configurations, obsolete docs etc. It's better to remove code
than let it rot. Interested parties are recommended to migrate to a
supported driver (preferrably the default driver for neutron - OVN), or
take over maintenance of the linuxbridge driver out-of-tree.
Change-Id: I2b3a08352fa5935db8ecb9da312b7ea4b4f7e43a
25d0273588