store: rename the 'opener' argument to 'openertype'

The 'opener' argument wasn't, in fact, an actual opener instance, but
rather something expected to return an opener. The normal argument,
from localrepository, is the scmutil.opener type; hence 'openertype'.

mercurial/store.py

@@ -236,10 +236,10 b' def _calcmode(path):'
 
 class basicstore(object):
     '''base class for local repository stores'''
-    def __init__(self, path, opener):
+    def __init__(self, path, openertype):
         self.path = path
         self.createmode = _calcmode(path)
-        op = opener(self.path)
+        op = openertype(self.path)
         op.createmode = self.createmode
         self.opener = scmutil.filteropener(op, encodedir)
 
@@ -285,10 +285,10 b' class basicstore(object):'
         pass
 
 class encodedstore(basicstore):
-    def __init__(self, path, opener):
+    def __init__(self, path, openertype):
         self.path = path + '/store'
         self.createmode = _calcmode(self.path)
-        op = opener(self.path)
+        op = openertype(self.path)
         op.createmode = self.createmode
         self.opener = scmutil.filteropener(op, encodefilename)
 
@@ -366,11 +366,11 b' class fncache(object):'
         return iter(self.entries)
 
 class fncachestore(basicstore):
-    def __init__(self, path, opener, encode):
+    def __init__(self, path, openertype, encode):
         self.encode = encode
         self.path = path + '/store'
         self.createmode = _calcmode(self.path)
-        op = opener(self.path)
+        op = openertype(self.path)
         op.createmode = self.createmode
         fnc = fncache(op)
         self.fncache = fnc
@@ -411,11 +411,11 b' class fncachestore(basicstore):'
     def write(self):
         self.fncache.write()
 
-def store(requirements, path, opener):
+def store(requirements, path, openertype):
     if 'store' in requirements:
         if 'fncache' in requirements:
             auxencode = lambda f: _auxencode(f, 'dotencode' in requirements)
             encode = lambda f: _hybridencode(f, auxencode)
-            return fncachestore(path, opener, encode)
-        return encodedstore(path, opener)
-    return basicstore(path, opener)
+            return fncachestore(path, openertype, encode)
+        return encodedstore(path, openertype)
+    return basicstore(path, openertype)