remotefilelog: handle copies in changesets in getrenamedfn() override

E.g. the {file_copies} template keyword didn't work with copies in
changesets before this patch because remotefilelog overrides the
getrenamedfn() and didn't handle the changeset-centric case.

Differential Revision: https://phab.mercurial-scm.org/D6542

hgext/remotefilelog/__init__.py

@@ -636,7 +636,7 b' def onetimeclientsetup(ui):'
     extensions.wrapfunction(changelog.changelog, 'add', changelogadd)
 
 def getrenamedfn(orig, repo, endrev=None):
-    if not isenabled(repo):
+    if not isenabled(repo) or copies.usechangesetcentricalgo(repo):
         return orig(repo, endrev)
 
     rcache = {}