tests/test-push-http.out

use 'x is None' instead of 'x == None'

The built-in None object is a singleton and it is therefore safe to
compare memory addresses with is. It is also faster, how much depends
on the object being compared. For a simple type like str I get:

            | s = "foo" | s = None
  ----------+-----------+----------
  s == None | 0.25 usec | 0.21 usec
  s is None | 0.17 usec | 0.17 usec

adding a
updating working directory
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
% expect ssl error
pushing to http://localhost/
searching for changes
ssl required
% serve errors
% expect authorization error
abort: authorization failed
pushing to http://localhost/
searching for changes
% serve errors
% expect authorization error: must have authorized user
abort: authorization failed
pushing to http://localhost/
searching for changes
% serve errors
% expect success
pushing to http://localhost/
searching for changes
adding changesets
adding manifests
adding file changes
added 1 changesets with 1 changes to 1 files
% serve errors
changegroup hook: HG_NODE=ba677d0156c1196c1a699fa53f390dcfc3ce3872 HG_SOURCE=serve HG_URL=remote:http 
rolling back last transaction
% expect authorization error: all users denied
abort: authorization failed
pushing to http://localhost/
searching for changes
% serve errors
% expect authorization error: some users denied, users must be authenticated
abort: authorization failed
pushing to http://localhost/
searching for changes
% serve errors