WT-8360 Remove WT_TEST output file when test finishes in recovery-tes…

…t script (#7262)

* Remove WT_TEST output from recovery script when test finished

* Added comment on why it is safe to clean the directories

* Tail the output of the  failing parrallel test

test/checkpoint/recovery-test.sh

@@ -40,4 +40,7 @@ while kill -STOP $pid ; do
 	./t -t r -D -v -h $recovery || exit 1
 done
 
+# Clean the home directory once the test is completed. Note that once we fail to send the signal to
+# stop the test, it means that it is completed.
+rm -rf $home $home.out
 exit 0

tools/run_parallel.sh

@@ -60,6 +60,7 @@ for i in $(seq $num_iter); do
     if [[ $err -ne 0 ]]
     then
       echo "iteration $i of parallel command $t failed with $err error code"
+      tail -n 100 nohup.out.$t
       exit $err
     fi
   done