Merge pull request #1708 from SmithChart/shelldriver-did-login

shelldriver: Disable kernel messages after console_ready

Author: Emantor

labgrid/driver/shelldriver.py

@@ -169,6 +169,7 @@ def _await_login(self):
                 # lets start over again and see if login or prompt will appear
                 # now.
                 self.console.sendline("")
+                did_login = True
 
             last_before = before