target/ssh.py: Add dump_target support

This adds the dump_target support when the ssh command fails with
a 'No route to host'. This is will provide additional data when a
Qemu target fails to respond during autobuilder testing. This does
not fix 14002 [0], but may help track down why qemu looses networking

[0] https://bugzilla.yoctoproject.org/show_bug.cgi?id=14002

(From OE-Core rev: cef1a2b03b359c018911abc29db1895d0f46814c)

Signed-off-by: Saul Wold <saul.wold@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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

@@ -88,6 +88,8 @@ class OESSHTarget(OETarget):
 
         status, output = self._run(sshCmd, processTimeout, True)
         self.logger.debug('Command: %s\nOutput:  %s\n' % (command, output))
+        if (status == 255) and (('No route to host') in output):
+            self.target_dumper.dump_target()
         return (status, output)
 
     def copyTo(self, localSrc, remoteDst):