Comment 6 for bug 1895928

The problems with the protocol error problems were due to me dropping too much of the 0409 patch: in addition to adding the pa_creds fields to the pa_client struct, it was also fixing a bug in the command argument parsing after continuing from an asynchronous hook invocation.

This version includes the fix for bug 1886854, to allow classic snaps to invoke module and daemon control related commands again.