Make SLURM plugin smarter

[ribab]

SLURM plguin (And other related plugins like ALPS) should be smarter

• To log invaluable debug information such as SLURM JOB ID
• To provide easy interface for controlling/using reservations and partitions
• To be more general and not only support certain commands
• To add a unique and auto-generated SLURM JOB NAME

The code could also be cleaned up

[DebRez]

Here is the code I am using to use srun in an salloc with Open MPI. Starts around line 443 of SLURM.py. Will this interfere with anyone else's use case? It also makes SLURM.py more specific rather than making it more general. @ribab

    # Add support for srun in --no-shell allocation
    if self.allocated and (cmds['command'] == 'srun') and ("--job-name" in cmds['allocate_cmd']
        parseAllocate_cmd = cmds['allocate_cmd'].split()
        for word in parseAllocate_cmd:
            word = word.strip()
            if '--job-name' in word:
                jobname = word[11:]
        jobid = int(subprocess.check_output(['squeue', '--noheader', '--format', '%i', '--name'
        cmdargs.append('--jobid=%d' % (jobid))