LAVA-777 lava-slave is now restartable
LAVA-777 lava-slave is now restartable

It's no longer required to cancel jobs when a slave is restarting.

Change-Id: I3c0546b211b3cd5b836c33dad79c80cf6b8aab5c

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