stream-clone: directly use `_entries_walk` to generate stream-v2
This does not requires that much changes and will give us much more
flexibility, like improving revlog handling to gracefully handle race
situation.
= Mercurial XXX =
== New Features ==
== Default Format Change ==
These changes affect newly created repositories (or new clones) done with
Mercurial XXX.
== New Experimental Features ==
== Bug Fixes ==
== Backwards Compatibility Changes ==
== Internal API Changes ==
== Miscellaneous ==