tools/test/stress2/misc: Fix and enable new tests

The previously committed versions of these tests failed to prevent
duplicate file names in the list of files to process, leading to
missing files when a "mv" commando tried to operate on a file that
had already been renamed.

The test for filenames containing UTF-16 surrogate pairs stays
disabled, since the required kernel changes have not been committed,
yet.

tools/test/stress2/misc/all.exclude

@@ -39,8 +39,6 @@ mount7.sh		https://people.freebsd.org/~pho/stress/log/log0549.txt		20240912
 mlockall2.sh		Unrecoverable OOM killing seen					20190203
 mlockall6.sh		https://people.freebsd.org/~pho/stress/log/log0430.txt		20230403
 mlockall7.sh		Needs further investigation					20210123
-msdos22.sh		Waiting for fix							20260529
-msdos23.sh		Waiting for fix							20260529
 msdos24.sh		Waiting for fix							20260529
 msetdomain.sh		May change policy for random threads to domainset_fixed		20210104
 newfs4.sh		watchdog fired. newbuf (still seen 20240729)			20190225

tools/test/stress2/misc/msdos22.sh

@@ -4,13 +4,13 @@
 
 MDUNIT=10
 FS=/mnt
-LOCALE=C.UTF-8
+LOCALE=C
 FILES=1000
 
 export LANG=$LOCALE
 
 randomfilename () {
-	name="f"
+	name=""
 	count=$(jot -r 1 10 3)
 	for r in $(jot -r $count 7 0); do
 		r=$(( r + 0 ))
@@ -40,14 +40,12 @@ randomfilename () {
 	cd $FS/test
 
 	for i in $(jot $FILES); do
-		newfile=$(randomfilename)
-		case $testfiles in
-		*"$newfile"*) continue;;
-		esac
-		testfiles="$(randomfilename)
-$testfiles"
+		testfiles="$testfiles
+$(randomfilename)"
 	done
 
+	testfiles=$(echo "$testfiles" | grep "." | sort -R | uniq)
+
 	for f in $testfiles; do
 		echo "$f" > $f
 	done

tools/test/stress2/misc/msdos23.sh

@@ -10,7 +10,7 @@ FILES=1000
 export LANG=$LOCALE
 
 randomfilename () {
-	name="f"
+	name=""
 	count=$(jot -r 1 10 3)
 	for r in $(jot -r $count 7 0); do
 		r=$(( r + 0 ))
@@ -40,14 +40,12 @@ randomfilename () {
 	cd $FS/test
 
 	for i in $(jot $FILES); do
-		newfile=$(randomfilename)
-		case $testfiles in
-		*"$newfile"*) continue;;
-		esac
-		testfiles="$(randomfilename)
-$testfiles"
+		testfiles="$testfiles
+$(randomfilename)"
 	done
 
+	testfiles=$(echo "$testfiles" | grep "." | sort -R | uniq)
+
 	for f in $testfiles; do
 		echo "$f" > $f
 	done

tools/test/stress2/misc/msdos24.sh

@@ -10,7 +10,7 @@ FILES=1000
 export LANG=$LOCALE
 
 randomfilename () {
-	name="f"
+	name=""
 	count=$(jot -r 1 10 3)
 	for r in $(jot -r $count 7 0); do
 		r=$(( r + 0 ))
@@ -41,14 +41,12 @@ randomfilename () {
 	cd $FS/test
 
 	for i in $(jot $FILES); do
-		newfile=$(randomfilename)
-		case $testfiles in
-		*"$newfile"*) continue;;
-		esac
-		testfiles="$(randomfilename)
-$testfiles"
+		testfiles="$testfiles
+$(randomfilename)"
 	done
 
+	testfiles=$(echo "$testfiles" | grep "." | sort -R | uniq)
+
 	for f in $testfiles; do
 		echo "$f" > $f
 	done