stress2: Permanently disable disruptive tests

tools/test/stress2/misc/devfs4.sh

@@ -32,4 +32,7 @@
 
 [ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1
 
+# This test creates havoc for a lot of programs
+exit 0
+
 umount -f /dev && mount /dev

tools/test/stress2/misc/syzkaller29.sh

@@ -26,6 +26,9 @@
 
 # Fixed by r368116
 
+# May change policy for random threads to to domainset_fixed
+exit 0
+
 . ../default.cfg
 cat > /tmp/syzkaller29.c <<EOF
 // https://syzkaller.appspot.com/bug?id=c3452066dba9238c4551010eb130944442d9174f

tools/test/stress2/misc/syzkaller30.sh

@@ -29,6 +29,9 @@
 
 # Fixed by r368462
 
+# May change policy for random threads to to domainset_fixed
+exit 0
+
 . ../default.cfg
 cat > /tmp/syzkaller30.c <<EOF
 // https://syzkaller.appspot.com/bug?id=6652adb41773e5c471c98342fefcbfb041af9ac8