Set timeout to 600.

Encountered two cases where the simulation would hang
indefinitely. Needs fixing.
Fixed logging to parallel threads.

Reusing of logging instances has been fixed by starting new processes
instead of threads.
Reduced timeout to 300 and added retry.

When a simulation with MultiSim.py fails, projConf.invokeSimulation()
now retrys up to 2 times by default.
Fixed possible issue with logClient logger caching