two servers of same lid at the same time connect

[SkyperTHC]

race condition where both try to spawn and 1 fails because the other got there first...(and the failing one should have done docker-exec instead of docker-run). would need mutex/semaphore but not sure we can give a damn.

equally it can happen that 2nd container sees that docker-run is already started and then tries docker-exec but the started one gets killed by the destructor.sh before docker-exec kicks in. Do we care and mutex it?