mdadm: Disable 10ddf-fail-spare and 10ddf-fail-stop-readd testcases

This always fails in my CI setup. There are some others which fail
intermittently however, this one is deterministic and fails always e.g.

    AssertionError:- [1/1]
    Failed ptests:
    {'mdadm': ['/usr/lib/mdadm/ptest/tests/10ddf-fail-spareFAILED_-_see_/usr/lib/mdadm/ptest/logs/10ddf-fail-spare.log_and_/usr/lib/mdadm/ptest/lo

Mark them broken for now.

(From OE-Core rev: 282cd99cea3a8089759947466b585c19892c61d9)

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-extended/mdadm/mdadm_4.2.bb

@@ -110,6 +110,8 @@ do_install_ptest() {
 	echo "intermittent failure on autobuilder" > ${D}${PTEST_PATH}/tests/19raid6check.broken
 	echo "intermittent failure on autobuilder" > ${D}${PTEST_PATH}/tests/20raid5journal.broken
 	echo "intermittent failure on autobuilder" > ${D}${PTEST_PATH}/tests/21raid5cache.broken
+	echo "intermittent failure on autobuilder" > ${D}${PTEST_PATH}/tests/10ddf-fail-spare.broken
+	echo "intermittent failure on autobuilder" > ${D}${PTEST_PATH}/tests/10ddf-fail-stop-readd.broken
 }
 
 RDEPENDS:${PN} += "bash"