Change usages of xrange() to range()

In Python3, range() creates a generator rather than a list.

None of the parameters in the ranges changed looked large enough
to create an impact in memory in Python2.  Note: the only use of
range() was for iteration and did not need to be changed.

This is part of a series of changes to introduce Python3 support.

Change-Id: I50b665f9296ea160a5076c71f36a65f76e47029f

git_config.py

@@ -168,7 +168,7 @@ class GitConfig(object):
       elif old != value:
         self._cache[key] = list(value)
         self._do('--replace-all', name, value[0])
-        for i in xrange(1, len(value)):
+        for i in range(1, len(value)):
           self._do('--add', name, value[i])
 
     elif len(old) != 1 or old[0] != value:

main.py

@@ -87,7 +87,7 @@ class _Repo(object):
     name = None
     glob = []
 
-    for i in xrange(0, len(argv)):
+    for i in range(len(argv)):
       if not argv[i].startswith('-'):
         name = argv[i]
         if i > 0:

repo

@@ -606,7 +606,7 @@ def _ParseArguments(args):
   opt = _Options()
   arg = []
 
-  for i in xrange(0, len(args)):
+  for i in range(len(args)):
     a = args[i]
     if a == '-h' or a == '--help':
       opt.help = True

subcmds/stage.py

@@ -58,7 +58,7 @@ The '%prog' command stages files to prepare the next commit.
       out.header('        %s', 'project')
       out.nl()
 
-      for i in xrange(0, len(all_projects)):
+      for i in range(len(all_projects)):
         p = all_projects[i]
         out.write('%3d:    %s', i + 1, p.relpath + '/')
         out.nl()