testimage: get real os-release file

/etc/os-release is a symlink to /usr/lib.
Symlink is retrieved as a dead link which points to nowhere if also the
original file is not accompanying it.
Fetch the real file in addition to this link.

Alternative could be to use "tar -h" (supported also by busybox tar),
however that could lose some important information if links are relevant
for failure analysis.

(From OE-Core rev: ed43f9ccb3c08845259e24440912631afd780d12)

(From OE-Core rev: 93efeca19f53132fce84d914b7ebf21070370127)

Signed-off-by: Peter Marko <peter.marko@siemens.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Signed-off-by: Steve Sakoman <steve@sakoman.com>

meta/classes-recipe/testimage.bbclass

@@ -26,7 +26,9 @@ TESTIMAGE_FAILED_QA_ARTIFACTS = "\
     ${localstatedir}/log \
     ${localstatedir}/volatile/log \
     ${sysconfdir}/version \
-    ${sysconfdir}/os-release"
+    ${sysconfdir}/os-release \
+    ${nonarch_libdir}/os-release \
+"
 
 # If some ptests are run and fail, retrieve corresponding directories
 TESTIMAGE_FAILED_QA_ARTIFACTS += "${@bb.utils.contains('DISTRO_FEATURES', 'ptest', '${libdir}/*/ptest', '', d)}"