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

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

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/hg.py	Wed Mar 01 11:00:12 2017 +0100
+++ b/mercurial/hg.py	Thu Mar 02 13:27:42 2017 +0100
@@ -40,6 +40,7 @@
     url,
     util,
     verify as verifymod,
+    vfs as vfsmod,
 )
 
 release = lock.release
@@ -219,8 +220,8 @@
 
     sharedpath = srcrepo.sharedpath # if our source is already sharing
 
-    destwvfs = scmutil.vfs(dest, realpath=True)
-    destvfs = scmutil.vfs(os.path.join(destwvfs.base, '.hg'), realpath=True)
+    destwvfs = vfsmod.vfs(dest, realpath=True)
+    destvfs = vfsmod.vfs(os.path.join(destwvfs.base, '.hg'), realpath=True)
 
     if destvfs.lexists():
         raise error.Abort(_('destination already exists'))
@@ -312,8 +313,8 @@
             else:
                 ui.progress(topic, pos + num)
         srcpublishing = srcrepo.publishing()
-        srcvfs = scmutil.vfs(srcrepo.sharedpath)
-        dstvfs = scmutil.vfs(destpath)
+        srcvfs = vfsmod.vfs(srcrepo.sharedpath)
+        dstvfs = vfsmod.vfs(destpath)
         for f in srcrepo.store.copylist():
             if srcpublishing and f.endswith('phaseroots'):
                 continue
@@ -369,7 +370,7 @@
         if e.errno != errno.EEXIST:
             raise
 
-    poolvfs = scmutil.vfs(pooldir)
+    poolvfs = vfsmod.vfs(pooldir)
     basename = os.path.basename(sharepath)
 
     with lock.lock(poolvfs, '%s.lock' % basename):
@@ -474,7 +475,7 @@
     if not dest:
         raise error.Abort(_("empty destination path is not valid"))
 
-    destvfs = scmutil.vfs(dest, expandpath=True)
+    destvfs = vfsmod.vfs(dest, expandpath=True)
     if destvfs.lexists():
         if not destvfs.isdir():
             raise error.Abort(_("destination '%s' already exists") % dest)