ssh: fixing rasing of CalledProcessErrorWithStderr

CalledProcessErrorWithStderr is a subclass of CalledProcessError that
also takes stderr output. Both that and normal output must be passed as
keyword arguments. They were being passed as keyword arguments inside
_scp() of SshConnection, causing cryptic errors to appear.

Additionally, "output" was not being properly poped off before invoking
super's init.

wlauto/utils/ssh.py

@@ -245,7 +245,8 @@ class SshShell(object):
         except subprocess.CalledProcessError as e:
             raise CalledProcessErrorWithStderr(e.returncode,
                                                e.cmd.replace(pass_string, ''),
-                                               e.output, getattr(e, 'error', ''))
+                                               output=e.output,
+                                               error=getattr(e, 'error', ''))
         except TimeoutError as e:
             raise TimeoutError(e.command.replace(pass_string, ''), e.output)