store: invoke "osutil.listdir()" via vfs

This patch invokes "osutil.listdir()" via vfs object.

The function added newly to "abstractvfs" is named not as "listdir()"
but as "readdir()", because:

  - "os.listdir()" seems to be more familiar as "listdir()" than
    "osutil.listdir()"

  - "osutil.listdir()" returns also type of each files like
    "readdir()" POSIX API: even though "d_type" field of "dirent"
    structure is defined mainly only on BSD/Linux

This patch invokes "osutil.listdir()" via "rawvfs" object to avoid
filename encoding, because the path passed to "osutil.listdir()"
shouldn't be encoded.

This patch also omits importing "osutil" module, because it is no
longer used.

mercurial/scmutil.py

@@ -219,6 +219,9 b' class abstractvfs(object):'
     def mkdir(self, path=None):
         return os.mkdir(self.join(path))
 
+    def readdir(self, path=None, stat=None, skip=None):
+        return osutil.listdir(self.join(path), stat, skip)
+
     def stat(self, path=None):
         return os.stat(self.join(path))
 

mercurial/store.py

@@ -6,7 +6,7 b''
 # GNU General Public License version 2 or any later version.
 
 from i18n import _
-import osutil, scmutil, util, parsers
+import scmutil, util, parsers
 import os, stat, errno
 
 _sha = util.sha1
@@ -311,9 +311,10 b' class basicstore(object):'
         l = []
         if self.rawvfs.isdir(path):
             visit = [path]
+            readdir = self.rawvfs.readdir
             while visit:
                 p = visit.pop()
-                for f, kind, st in osutil.listdir(p, stat=True):
+                for f, kind, st in readdir(p, stat=True):
                     fp = p + '/' + f
                     if kind == stat.S_IFREG and f[-2:] in ('.d', '.i'):
                         n = util.pconvert(fp[striplen:])