Add trigger for bluegene block error state

doc/man/man1/strigger.1

slurm/slurm.h.in

src/plugins/select/bluegene/plugin/bg_job_place.c

src/plugins/select/bluegene/plugin/bluegene.c

src/plugins/select/bluegene/plugin/select_bluegene.c

src/slurmctld/trigger_mgr.c

src/slurmctld/trigger_mgr.h

src/strigger/opts.c

src/strigger/strigger.c

src/strigger/strigger.h

testsuite/expect/test19.3