bundle2: move version of stream clone into part name
I don't like having version numbers as part parameters. It means
that parts can theoretically vary wildly in their generation and
processing semantics. I think that a named part should have consistent
behavior over time. In other words, if you need to introduce new
functionality or behavior, that should be expressed by inventing
a new bundle2 part, not adding functionality to an existing part.
This commit applies this advice to the just-introduced stream clone
via bundle2 feature.
The "version" part parameter is removed. The name of the bundle2 part
is now "stream2" instead of "stream" with "version=v2".
Differential Revision: https://phab.mercurial-scm.org/D1927
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