tests: run nosetests in cloudinit/ directory, fix py26 fallout.

When we moved some tests to live under cloudinit/ we inadvertantly
failed to change all things that would run nose to include that
directory.

This changes all the 'nose' invocations to consistently run with
tests/unittests and cloudinit/.

Also, it works around, more correctly this time, a python2.6-ism with
the following code:
   with assertRaises(SystemExit) as cm:
      sys.exit(2)

0 files changed, 0 insertions, 0 deletions