run_tests.py fails

glance revno 145
run_tests.py: make run_tests.py work.

Without this patch, the following exception occurs.

  Traceback (most recent call last):
    File "run_tests.py", line 280, in <module>
      sys.exit(not core.run(config=c, testRunner=runner))
    File "/home/yamahata/openstack/src/glance/my/.glance-venv/lib/python2.6/site
  ackages/nose/core.py", line 283, in run
      return TestProgram(*arg, **kw).success
    File "/home/yamahata/openstack/src/glance/my/.glance-venv/lib/python2.6/site
  ackages/nose/core.py", line 118, in __init__
      **extra_args)
    File "/usr/lib/python2.6/unittest.py", line 817, in __init__
      self.runTests()
    File "/home/yamahata/openstack/src/glance/my/.glance-venv/lib/python2.6/site
  ackages/nose/core.py", line 197, in runTests
      result = self.testRunner.run(self.test)
    File "/home/yamahata/openstack/src/glance/my/.glance-venv/lib/python2.6/site
  ackages/nose/core.py", line 59, in run
      result = self._makeResult()
    File "run_tests.py", line 268, in _makeResult
      self.config)
    File "run_tests.py", line 183, in __init__
      if colorizer.supported():
    File "run_tests.py", line 92, in supported
      curses.setupterm()