Don't shadow open builtin.

Turns out, builtin works fine with shlex with python 3.

apachedex/__init__.py

@@ -82,7 +82,6 @@ if sys.version_info >= (3, 3):
   bz2_open = bz2.open
   _read_mode = 'rt'
 else:
-  open = codecs.open
   gzip_open = _wrapOpen(gzip_open)
   bz2_open = _wrapOpen(bz2.BZ2File)
   _read_mode = 'r'
@@ -1371,7 +1370,7 @@ def main():
     if state_file_name == '-':
       state_file = sys.stdin
     else:
-      state_file = open(state_file_name, encoding='ascii')
+      state_file = codecs.open(state_file_name, encoding='ascii')
     with state_file:
       load_start = time.time()
       state = json.load(state_file)
@@ -1423,7 +1422,7 @@ def main():
           logfile.seek(0)
           break
       else:
-        logfile = open(filename, _read_mode, encoding=INPUT_ENCODING)
+        logfile = codecs.open(filename, _read_mode, encoding=INPUT_ENCODING)
     lineno = 0
     for lineno, line in enumerate(logfile, 1):
       if show_progress and lineno % 5000 == 0: