vfs: use 'vfs' module directly in 'mercurial.store'

vfs: use 'vfs' module directly in 'mercurial.store'

Now that the 'vfs' classes moved in their own module, lets use the new module
directly. We update code iteratively to help with possible bisect needs in the
future.

--- a/mercurial/store.py	Thu Mar 02 13:29:59 2017 +0100
+++ b/mercurial/store.py	Thu Mar 02 13:30:10 2017 +0100
@@ -17,8 +17,8 @@
     error,
     parsers,
     pycompat,
-    scmutil,
     util,
+    vfs as vfsmod,
 )
 
 # This avoids a collision between a file named foo and a dir named
@@ -325,7 +325,7 @@
         self.createmode = _calcmode(vfs)
         vfs.createmode = self.createmode
         self.rawvfs = vfs
-        self.vfs = scmutil.filtervfs(vfs, encodedir)
+        self.vfs = vfsmod.filtervfs(vfs, encodedir)
         self.opener = self.vfs
 
     def join(self, f):
@@ -398,7 +398,7 @@
         self.createmode = _calcmode(vfs)
         vfs.createmode = self.createmode
         self.rawvfs = vfs
-        self.vfs = scmutil.filtervfs(vfs, encodefilename)
+        self.vfs = vfsmod.filtervfs(vfs, encodefilename)
         self.opener = self.vfs
 
     def datafiles(self):
@@ -477,9 +477,9 @@
             self._load()
         return iter(self.entries)
 
-class _fncachevfs(scmutil.abstractvfs, scmutil.auditvfs):
+class _fncachevfs(vfsmod.abstractvfs, vfsmod.auditvfs):
     def __init__(self, vfs, fnc, encode):
-        scmutil.auditvfs.__init__(self, vfs)
+        vfsmod.auditvfs.__init__(self, vfs)
         self.fncache = fnc
         self.encode = encode