localrepo: use "self.wvfs.join()" instead of "os.path.join()"...
localrepo: use "self.wvfs.join()" instead of "os.path.join()"
As a part of migration to vfs, this patch uses "self.wvfs.join()"
instead of "os.path.join()", while initialization of fields in the
constructor of "localrepository" class.