changegroup: don't limit cgv4 to revlogv2 repos...
changegroup: don't limit cgv4 to revlogv2 repos
To help the transition from revlogv1 to revlogv2, we need to be able to enable
cgv4 for revlogv1 repos, so that revlogv2 clients can handle adding/removing
sidedata over the wire.
Differential Revision:
https://phab.mercurial-scm.org/D10342