[MERGE] Remove registrations of defunct HPSS verbs.

[John Arbash Meinel]

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Andrew Bennetts wrote:
> Hi,
> 
> This patch fixes a bit of fallout from the VersionedFiles landing: we removed a
> couple of smart protocol verbs, but forgot to remove their request handlers.
> This was causing a compatibility problem with older clients, which would try
> these requests and get an unexpected error from the server:
> 
>     Could not understand response from smart server: ('error', "'module' object
>     has no attribute 'SmartServerRepositoryStreamRevisionsChunked'")
> 
> This simple patch fixes this by removing the register_lazy calls for the absent
> request handlers, and also adds a test that all registered request_handlers
> exist so that this error can't happen again.
> 
> Thanks to stewart on #bzr for reporting this.
> 
> -Andrew.
> 
> 

BB:approve

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