hso: clean up connect and disconnect

Disconnect didn't actually work for HSO since it overrode the parent
class's connect handler and thus didn't set the right state after
the connection was made.  It turns out we can use the same logic
that 'mbm' does for connection and not have to override quite so
much of the parent class.

This also splits the authentication and connection parts into two
distinct stages, which wasn't the case before but was what was
intended.

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