insane.conf: add new libexec test

This tests for /usr/libexec as we are moving things to /lib/.
the test is ignored if the distro defaults to /usr/libexec.

Currently this test will be disabled by default since the current
value of ${libexecdir} is "/usr/libexec".  Also this tests needs
to be enabled in the WARN_QA list.

[YOCTO #2915]

(From OE-Core rev: 4c60c2779dde6962f342f9c9b61713cf2d3a564c)

Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/classes/insane.bbclass

@@ -140,6 +140,20 @@ def package_qa_handle_error(error_class, error_msg, d):
         bb.warn("QA Issue: %s" % error_msg)
         return True
 
+QAPATHTEST[libexec] = "package_qa_check_libexec"
+def package_qa_check_libexec(path,name, d, elf, messages):
+
+    # Skip the case where the default is explicitly /usr/libexec
+    libexec = d.getVar('libexecdir', True)
+    if libexec == "/usr/libexec":
+        return True
+
+    if 'libexec' in path.split(os.path.sep):
+        messages.append("%s: %s is using libexec please relocate to %s" % (name, package_qa_clean_path(path, d), libexec))
+        return False
+
+    return True
+
 QAPATHTEST[rpaths] = "package_qa_check_rpath"
 def package_qa_check_rpath(file,name, d, elf, messages):
     """