mpiCheckPhaseHook: disable openmpi's ssh plugin

openmpi requires SSH to run. Set flags to run off SSH usage.

pkgs/build-support/setup-hooks/mpi-check-hook/mpi-check-hook.sh

@@ -6,7 +6,6 @@ setupMpiCheck() {
   # Find out which MPI implementation we are using
   # and set safe defaults that are guaranteed to run
   # on any build machine
-
   mpiType="NONE"
 
   # OpenMPI signature
@@ -41,6 +40,10 @@ setupMpiCheck() {
       export OMPI_MCA_rmaps_base_oversubscribe=1
       export PRTE_MCA_rmaps_default_mapping_policy=node:oversubscribe
 
+      # Make sure we do not need openssh in the checkPhase
+      export OMPI_MCA_plm_ssh_agent=false
+      export PRRTE_MCA_plm_ssh_agent=false
+
       # Disable CPU pinning
       export OMPI_MCA_hwloc_base_binding_policy=none
       export PRTE_MCA_hwloc_default_binding_policy=none