backup slurmdbd support implemented

NEWS

slurm/slurm.h.in

src/api/config_info.c

src/common/assoc_mgr.c

src/common/read_config.c

src/common/slurm_protocol_api.c

src/common/slurm_protocol_api.h

src/common/slurm_protocol_pack.c

src/common/slurmdbd_defs.c

src/database/mysql_common.c

src/database/mysql_common.h

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

src/slurmdbd/Makefile.am

src/slurmdbd/Makefile.in

src/slurmdbd/read_config.c

src/slurmdbd/read_config.h

src/slurmdbd/slurmdbd.c

src/slurmdbd/slurmdbd.h