Add security test for strigger command

testsuite/slurm_unit/slurmctld/security_2_7.sh

+#!/bin/sh
+# Define location of slurm executables (if not in default search path)
+#slurm_bin="/home/jette/slurm.mdev/bin/"
+
+# Build the script
+wd=`pwd`
+tst_in=$wd/security_2_7_in
+tst_out=$wd/security_2_7_out
+rm -f $tst_in $tst_out
+echo '#!/bin/sh'     >$tst_in
+echo "id >$tst_out" >>$tst_in
+chmod 700 $tst_in
+
+# Set the trigger
+echo "Executing:"
+echo "${slurm_bin}strigger --set --idle --offset=0 --program=$tst_in"
+echo ""
+${slurm_bin}strigger --set --idle --offset=0 --program=$tst_in
+
+# Wait for trigger event and test the results
+if [ "$?" -eq 0 ]
+then
+    echo "Waiting for trigger event, this take 20 seconds"
+    sleep 20
+    if [ -f $tst_out ]
+    then 
+        echo "Trigger ran as this user:"
+        cat $tst_out
+        echo "If that's not your user and group id, this is a failure"
+    else
+        echo "FAILURE: No output file generated for trigger event"
+    fi
+else
+    echo "If this failure is a security violation, that's fine"
+fi
+
+# Clean up
+rm -f $tst_in $tst_out