Fix regression in https://bugs.launchpad.net/lava-scheduler/+bug/1202285 by ensuring that the count of devices in roles which use the same device_type as another role is aggregated, not ignored.
Fix regression in https://bugs.launchpad.net/lava-scheduler/+bug/1202285
by ensuring that the count of devices in roles which use the
same device_type as another role is aggregated, not ignored.

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