when the slurmctld is under heavy load.

Add SlurmDbdAddr and SlurmDbdPort configuration parameters.

    sbatch commands.

    increased from 64KB (16-bit size field) to 4GB (32-bit size field).

none configured.

checkpoint as required, still need to perform actual checkpoint 
operation

changed slurm_send_recv_controller_rc_msg to handle all rm messages instead of just SLURM_RC_MESSAGE

slurm_send_recv_controller_msg() rather than use it's own 
logic. This provides much better support for the backup 
controller during the fail-over period.