LAVA-1123 - Hidden device types
LAVA-1123 - Hidden device types

LAVA-1209 - owners_only field in admin interface
LAVA-1210 - reject public submissions
LAVA-1213 - prevent hidden devices being returned to the pool
            by device owners.
LAVA-1211 - hide devices of hidden device types in tables.
LAVA-1212 - hide hidden device types in the overview
LAVA-1229 - block searches for hidden device types

Add docs on hidden device types.

Change-Id: I89d4191ae34d7c3635b1d81810bc02d681ad5665

Linaro/lava-server,Linaro/lava-server,Linaro/lava-server,Linaro/lava-server