Drift: error codes

[jjhursey]

https://github.com/openpmix/pmix-tests/blob/08705b12294fc5020f2af951b9bb10b36b6cec8d/check-standard/etc/openpmix_master-pmix-standard_master.txt#L60-L69

#---------------------------------------------------------
# Needs Review:
#  OpenPMIx: 5dab544ec
#  OpenPMIx PR: 
#---------------------------------------------------------
PMIX_ERR_EXIT_NONZERO_TERM
PMIX_ERR_PROC_ABORTED_BY_SIG
PMIX_ERR_PROC_FAILED_TO_START
PMIX_ERR_PROC_KILLED_BY_CMD
PMIX_ERR_PROC_SENSOR_BOUND_EXCEEDED