t/300*: add HWLOC_COMPONENTS=-gl to mpi tests

problem: some hwloc versions try to connect to the x11 port if it exists
causing all kinds of problems

solution: set the env var to tell hwloc to not do that

t/t3000-mpi-basic.t

@@ -16,6 +16,8 @@ if ! test -x ${HELLO}; then
     test_done
 fi
 
+# work around https://github.com/open-mpi/ompi/issues/7701 and similar in mpich
+export HWLOC_COMPONENTS=-gl
 export TEST_UNDER_FLUX_CORES_PER_RANK=4
 SIZE=2
 MAX_MPI_SIZE=$(($SIZE*$TEST_UNDER_FLUX_CORES_PER_RANK))

t/t3003-mpi-abort.t

@@ -33,11 +33,13 @@ if ! test -x ${FLUX_BUILD_DIR}/t/mpi/abort; then
     test_done
 fi
 
+# work around https://github.com/open-mpi/ompi/issues/7701 and similar in mpich
+export HWLOC_COMPONENTS=-gl
 export TEST_UNDER_FLUX_CORES_PER_RANK=4
 SIZE=2
 MAX_MPI_SIZE=$(($SIZE*$TEST_UNDER_FLUX_CORES_PER_RANK))
 test_under_flux $SIZE job
-
+set -x
 OPTS="-ocpu-affinity=off"
 
 diag() {