Bug fixes for single test runs in zfs-tests

Correctly remove the temporary runfile after the
single test is run.

Cleanup and setup scripts are relative to the
test suite's location, correct how we look for
those scripts.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Giuseppe Di Natale <dinatale2@llnl.gov>
Closes #5844

scripts/zfs-tests.sh

@@ -154,7 +154,7 @@ find_runfile() {
 usage() {
 cat << EOF
 USAGE:
-$0 [hvqxkf] [-s SIZE] [-r RUNFILE]
+$0 [hvqxkf] [-s SIZE] [-r RUNFILE] [-t PATH] [-u USER]
 
 DESCRIPTION:
 	ZFS Test Suite launch script
@@ -169,7 +169,7 @@ OPTIONS:
 	-d DIR      Use DIR for files and loopback devices
 	-s SIZE     Use vdevs of SIZE (default: 4G)
 	-r RUNFILE  Run tests in RUNFILE (default: linux.run)
-	-t PATH     Run single test at PATH
+	-t PATH     Run single test at PATH relative to test suite
 	-u USER     Run single test as USER (default: root)
 
 EXAMPLES:
@@ -264,11 +264,11 @@ EOF
 		SETUPSCRIPT=
 		CLEANUPSCRIPT=
 
-		if [ -f "$SINGLETESTDIR/setup.ksh" ]; then
+		if [ -f "$STF_SUITE/$SINGLETESTDIR/setup.ksh" ]; then
 			SETUPSCRIPT="setup"
 		fi
 
-		if [ -f "$SINGLETESTDIR/cleanup.ksh" ]; then
+		if [ -f "$STF_SUITE/$SINGLETESTDIR/cleanup.ksh" ]; then
 			CLEANUPSCRIPT="cleanup"
 		fi
 
@@ -409,7 +409,7 @@ RESULT=$?
 echo
 
 if [ ${#SINGLETEST[@]} -ne 0 ]; then
-	rm -f "$RUNFILEDIR/$RUNFILE" &>/dev/null
+	rm -f "$RUNFILE" &>/dev/null
 fi
 
 exit ${RESULT}