Require pscheduler-core so plugins can use the "warmboot" internal.
Require pscheduler-core so plugins can use the "warmboot" internal.

perfsonar/pscheduler,mfeit-internet2/pscheduler-dev,perfsonar/pscheduler,perfsonar/pscheduler,mfeit-internet2/pscheduler-dev,perfsonar/pscheduler