remove PM_PID, because PM is not a child of this shell

tests/check_ecmwf_attr.sh.in

tests/check_ecmwf_events.sh.in

tests/check_ecmwf_handle.sh.in

tests/check_pm_declare.sh.in

tests/check_pm_declare_group.sh.in

tests/check_pm_interlock.sh.in

tests/check_subscribe.sh.in