Drift: Session items

[jjhursey]

List: https://github.com/openpmix/pmix-tests/blob/08705b12294fc5020f2af951b9bb10b36b6cec8d/check-standard/etc/openpmix_master-pmix-standard_master.txt#L145-L165

#---------------------------------------------------------
# Needs Review:
#  OpenPMIx: 261702212
#  OpenPMIx PR: 
#---------------------------------------------------------
PMIX_ALLOC_PREEMPTIBLE
PMIX_SESSION_APP
PMIX_SESSION_COMPLETE
PMIX_SESSION_CTRL_ID
PMIX_SESSION_PAUSE
PMIX_SESSION_PREEMPT
PMIX_SESSION_PROVISION
PMIX_SESSION_PROVISION_IMAGE
PMIX_SESSION_PROVISION_NODES
PMIX_SESSION_RESTORE
PMIX_SESSION_RESUME
PMIX_SESSION_SIGNAL
PMIX_SESSION_TERMINATE
PMIX_ALLOC_REQ_CANCEL
pmix_server_session_control_fn_t
PMIx_Session_control