Comment out fallback lines

Author: shuds13

examples/libE_submission_scripts/submit_distrib_mpi4py.sh

@@ -20,10 +20,11 @@ export NUM_WORKERS=4
 export MANAGER_NODE=false # true = Manager has a dedicated node (assign one extra)
 export USE_NODE_LIST=true # If false, allow libE to determine node_list from environment.
 
+# Sometimes may be necessary
 # As libE shares nodes with user applications allow fallback if contexts overrun.
-unset I_MPI_FABRICS
-export I_MPI_FABRICS_LIST=tmi,tcp
-export I_MPI_FALLBACK=1
+# unset I_MPI_FABRICS
+# export I_MPI_FABRICS_LIST=tmi,tcp
+# export I_MPI_FALLBACK=1
 
 # If using in calling script (After N mins manager kills workers and exits cleanly)
 export LIBE_WALLCLOCK=55