[tests/unit] fix name of ms_dotnet negative case, assert that Sensu package is installed
[tests/unit] fix name of ms_dotnet negative case, assert that Sensu package is installed

cwjohnston/sensu-chef,klamontagne/sensu-chef,cwjohnston/sensu-chef,sensu/sensu-chef,sensu/sensu-chef,klamontagne/sensu-chef