remove unused files

removes the following unused files:

nova.sh - was used for testing. Now I use the test_nova file from
the openstack modules

tests directory - no longer used, replaced by rspec tests in spec and
deployment examples in examples

TODO - should not be included, open ticket in launchpad

Change-Id: Ie898d787fd5f38a1bde0b04da39f4786a21bd379