Catch EntryParallelWorker KeyError exceptions, update mem per entry to 120 MB

Catch the KeyError if EntryParallelWorkers is not set in the config and set
the value to zero for dynamic scaling.  (This happens if the factory op
didn't run reconfig).

Based on the Pss per entry process in v2.6 on the UCSD production factory,
update the glideFactoryEntry memory estimate to 120 MB.