Merge pull request #100 from ceph/wip-tests

Add test for teuthology.suite.build_email_body()
Put helper scripts in /usr/bin
Merge pull request #101 from ceph/fix-adjust-ulimits-b

Put helper scripts in /usr/bin
Add pytest.ini

So far this just tells py.test not to recurse into directories
containing tests it doesn't need to run.
Update many unit tests to reflect 2yrs of changes

These tests hadn't been updated in over two years. Only one is left
failing.