oeqa/runtime: set self.runner and handle None

Set default self.runner to None. qemu target sets
the runner to qemu. Then handle self.runner None in
run_network_serialdebug(). This way ssh runner
and failing ping or ssh tests handle the error cases.

(From OE-Core rev: 39f72147ef402bea54a66abf984315c1f93aa141)

Signed-off-by: Mikko Rapeli <mikko.rapeli@linaro.org>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/lib/oeqa/core/target/__init__.py

@@ -10,6 +10,7 @@ class OETarget(object):
 
     def __init__(self, logger, *args, **kwargs):
         self.logger = logger
+        self.runner = None
 
     @abstractmethod
     def start(self):

meta/lib/oeqa/runtime/case.py

@@ -23,6 +23,8 @@ class OERuntimeTestCase(OETestCase):
         uninstall_package(self)
 
 def run_network_serialdebug(runner):
+    if not runner:
+        return
     status, output = runner.run_serial("ip addr")
     print("ip addr on target: %s %s" % (output, status))
     status, output = runner.run_serial("ping -c 1 %s" % self.target.server_ip)