cleaned up env code once again. all env for jobs happens in slurmd/smgr.c...

cleaned up env code once again.  all env for jobs happens in slurmd/smgr.c setup for env is done within slurmd/mgr.c to new variable in slurmd_job_t *job ->envtp which is an env_t *.  All variables are setup there except for when srun runs the script instead of slurmd.  For the srun case things are the same as before.