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/misc.py

@@ -85,6 +85,7 @@ class TimeoutError(Exception):
 class CalledProcessErrorWithStderr(CalledProcessError):
 
     def __init__(self, *args, **kwargs):
+        self.output = kwargs.pop("output")
         self.error = kwargs.pop("error")
         super(CalledProcessErrorWithStderr, self).__init__(*args, **kwargs)