oeqa/selftest/context: Reload testlayer_path when meta-selftest isn't added

When add meta-selftest by the script the testlayer_path needs to be
reloaded to avoid None value.

(From OE-Core rev: d1120849e12c46aa46b02905a3f43c0853bd11a0)

Signed-off-by: Aníbal Limón <anibal.limon@linux.intel.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/lib/oeqa/selftest/context.py

@@ -131,6 +131,7 @@ class OESelftestTestContextExecutor(OETestContextExecutor):
                     runCmd("bitbake-layers add-layer %s" %meta_selftestdir)
                     # reload data is needed because a meta-selftest layer was add
                     self.tc.td = get_bb_vars()
+                    self.tc.testlayer_path = get_test_layer()
                 else:
                     self.tc.logger.error("could not locate meta-selftest in:\n%s" % meta_selftestdir)
                     raise OEQAPreRun