don't create a slurmdbd agent from sacctmgr or sacct

src/common/slurm_accounting_storage.c

src/common/slurm_accounting_storage.h

src/common/slurmdbd_defs.c

src/common/slurmdbd_defs.h

...s/accounting_storage/filetxt/accounting_storage_filetxt.c

...plugins/accounting_storage/gold/accounting_storage_gold.c

...ugins/accounting_storage/mysql/accounting_storage_mysql.c

...plugins/accounting_storage/none/accounting_storage_none.c

...ugins/accounting_storage/pgsql/accounting_storage_pgsql.c

...accounting_storage/slurmdbd/accounting_storage_slurmdbd.c

src/sacct/options.c

src/sacctmgr/sacctmgr.c

src/slurmctld/controller.c

src/slurmdbd/proc_req.c

src/slurmdbd/slurmdbd.c