shelldriver: fix bogus self.status variable assigment

Variable which is used by the driver is self._status.

Signed-off-by: Petr Štetiar <[email protected]>

Author: ynezz

labgrid/driver/shelldriver.py

@@ -175,7 +175,7 @@ def _await_login(self):
                 else:
                     # we got a prompt. no need for any further action to
                     # activate this driver.
-                    self.status = 1
+                    self._status = 1
                     break
 
             elif index == 1: