tests: use KNOWN_FAIL for lsns/ioctl_ns

It seems 32bit userspace on 64bit kernel return ENOTTY for
NS_GET_USERNS ioctl (for example when execute tests in mock
environment).

Addresses: #1924
Signed-off-by: Karel Zak <kzak@redhat.com>

tests/ts/lsns/ioctl_ns

@@ -34,6 +34,15 @@ ts_check_prog "mkfifo"
 ts_check_prog "touch"
 ts_check_prog "uniq"
 
+# 32bit userspace (NS ioctls) does not work as expected with 64bit kernel
+WORDSIZE=$($TS_HELPER_SYSINFO WORDSIZE)
+if [ $WORDSIZE -eq 32 ]; then
+	uname -m | grep -q 64
+	if [ $? -eq 0 ]; then
+		TS_KNOWN_FAIL="yes"
+	fi
+fi
+
 $TS_CMD_UNSHARE --user --pid --mount-proc --fork true &> /dev/null || ts_skip "no namespace support"
 
 ts_cd "$TS_OUTDIR"