filelog: remove version attribute (API)

filelog: remove version attribute (API)

This was only used by verify code. The check it was used for is now
implemented as part of the verifyintegrity() implementation. The
attribute is now unused, is revlog-specific, and isn't appropriate
to be exposing on the file storage interface. So drop it.

Differential Revision: https://phab.mercurial-scm.org/D4702

--- a/mercurial/filelog.py	Wed Sep 19 11:17:28 2018 -0700
+++ b/mercurial/filelog.py	Wed Sep 19 11:20:02 2018 -0700
@@ -27,8 +27,6 @@
         self.filename = path
         # Used by repo upgrade.
         self.index = self._revlog.index
-        # Used by verify.
-        self.version = self._revlog.version
         # Used by changegroup generation.
         self._generaldelta = self._revlog._generaldelta
 

--- a/mercurial/repository.py	Wed Sep 19 11:17:28 2018 -0700
+++ b/mercurial/repository.py	Wed Sep 19 11:20:02 2018 -0700
@@ -737,12 +737,6 @@
 class ifilestorage(ifileindex, ifiledata, ifilemutation):
     """Complete storage interface for a single tracked file."""
 
-    version = interfaceutil.Attribute(
-        """Version number of storage.
-
-        TODO this feels revlog centric and could likely be removed.
-        """)
-
     _generaldelta = interfaceutil.Attribute(
         """Whether deltas can be against any parent revision.
 

--- a/tests/simplestorerepo.py	Wed Sep 19 11:17:28 2018 -0700
+++ b/tests/simplestorerepo.py	Wed Sep 19 11:20:02 2018 -0700
@@ -109,8 +109,6 @@
         # This is used by changegroup code :/
         self._generaldelta = True
 
-        self.version = 1
-
     def _refreshindex(self):
         self._indexbynode.clear()
         self._indexbyrev.clear()