Add ctest loop script to system tests

nav2_system_tests/scripts/ctest_loop.bash

+#!/bin/bash
+
+#
+# Simple bash script to loop over the navigation2 "bt_navigator" system test
+#
+# options:
+# -c <#> - number of times to loop
+# -o <file> - name of summary output file
+# -l <file> - name to use for failing log files
+# -d <dds> - name of DDS implementation to use (ex: rmw_fastrtps_cpp)
+
+failcount=0
+loopcount=1
+
+while getopts c:o:l:d: option
+  do
+    case "$option"
+    in
+      c) loopcount=$OPTARG;;
+      o) outfile=$OPTARG;;
+      l) logfile=$OPTARG;;
+      d) dds=$OPTARG;;
+    esac
+  done
+
+echo "Total loop count = " $loopcount
+export RMW_IMPLEMENTATION=$dds
+
+for ((i=1; i<=$loopcount; i++))
+  do
+    echo "******************************"
+    echo "Loop number: " $i
+    echo "Running with DDS: " $dds
+    echo "******************************"
+
+    ctest -V -R test_bt_navigator$ -O $logfile
+    result=$?
+    echo "RESULT =" $result
+    if [ "$result" != "0" ]
+    then
+      ((failcount+=1))
+      echo "TEST $i FAILED" >> $outfile
+      mv $logfile $logfile.$i.fail
+    fi
+    echo $i "TESTS COMPLETED"
+    echo $failcount "TOTAL FAILURES"
+  done
+echo $failcount " FAILURES / " $loopcount
+echo $failcount " FAILURES / " $loopcount >> $outfile
+