clean up of variable names, including config.h inttype.h, etc

src/common/slurm_protocol_api.c

src/common/slurm_protocol_api.h

src/common/slurm_protocol_common.h

src/common/slurm_protocol_defs.h

src/common/slurm_protocol_interface.h

src/common/slurm_protocol_pack.c

src/common/slurm_protocol_pack.h

src/common/slurm_protocol_socket_implementation.c

src/common/slurm_protocol_util.c

src/common/slurm_protocol_util.h