Some fixes for supporting python3

* Fix imports.
* Use python3 syntax.
* Wrap map() calls with list().
* Use list() only wherever needed.
  (Thanks Conley!)
* Fix dictionary iteration methods
  (s/iteritems/items/).
* Make use of sorted() in appropriate places
* Use iterators directly in the loop.
* Don't use .keys() wherever it isn't needed.
* Use sys.maxsize instead of sys.maxint

TODO:
* Make repo work fully with python3. :)

Some of this was done by the '2to3' tool [1], by
applying the needed fixes in a way that doesn't
break compatibility with python2.

Links:
[1]: http://docs.python.org/2/library/2to3.html

Change-Id: Ibdf3bf9a530d716db905733cb9bfef83a48820f7
Signed-off-by: Chirayu Desai <cdesai@cyanogenmod.org>

subcmds/upload.py

@@ -23,6 +23,11 @@ from editor import Editor
 from error import HookError, UploadError
 from project import RepoHook
 
+try:
+  input = raw_input
+except NameError:
+  pass
+
 UNUSUAL_COMMIT_THRESHOLD = 5
 
 def _ConfirmManyUploads(multiple_branches=False):
@@ -33,7 +38,7 @@ def _ConfirmManyUploads(multiple_branches=False):
     print('ATTENTION: You are uploading an unusually high number of commits.')
   print('YOU PROBABLY DO NOT MEAN TO DO THIS. (Did you rebase across '
         'branches?)')
-  answer = raw_input("If you are sure you intend to do this, type 'yes': ").strip()
+  answer = input("If you are sure you intend to do this, type 'yes': ").strip()
   return answer == "yes"
 
 def _die(fmt, *args):