launchpad-developer-dependencies should include python-elementtree

[Barry Warsaw]

The Launchpad test suite apparently requires python-elementtree, otherwise you get a traceback like this:

% python2.4 test.py -t mail
...
Traceback (most recent call last):
  File "/home/barry/projects/launchpad/pristine/importfascist.py", line 146, in import_fascist
    module = original_import(name, globals, locals, fromlist)
  File "/home/barry/projects/launchpad/pristine/lib/canonical/launchpad/scripts/tests/test_sftracker.py", line 14, in ?
    from canonical.launchpad.scripts import sftracker
  File "/home/barry/projects/launchpad/pristine/importfascist.py", line 146, in import_fascist
    module = original_import(name, globals, locals, fromlist)
  File "/home/barry/projects/launchpad/pristine/lib/canonical/launchpad/scripts/sftracker.py", line 35, in ?
    import elementtree.ElementTree as ET
  File "/home/barry/projects/launchpad/pristine/importfascist.py", line 146, in import_fascist
    module = original_import(name, globals, locals, fromlist)
ImportError: No module named elementtree.ElementTree

The launchpad-developer-dependencies meta-package should require python-elementtree