Remove unused imports

Author: Theofilos Manitaras

reframe/core/schedulers/pbs.py

@@ -19,7 +19,6 @@
 import reframe.core.schedulers as sched
 import reframe.utility.osext as osext
 from reframe.core.backends import register_scheduler
-from reframe.core.config import settings
 from reframe.core.exceptions import JobError, JobSchedulerError
 from reframe.utility import seconds_to_hms
 

reframe/core/schedulers/slurm.py

@@ -11,7 +11,6 @@
 from argparse import ArgumentParser
 from contextlib import suppress
 
-import reframe.core.environments as env
 import reframe.core.runtime as rt
 import reframe.core.schedulers as sched
 import reframe.utility.osext as osext