contrib/pipelines/secadvisor: Add Transformer unit tests
contrib/pipelines/secadvisor: Add Transformer unit tests

To allow easier and safer changes in the future, add unit tests for the
secadvisor pipeline's Transformer implementation.

lebauce/skydive,skydive-project/skydive,skydive-project/skydive,lebauce/skydive,lebauce/skydive,lebauce/skydive,lebauce/skydive,skydive-project/skydive,skydive-project/skydive,lebauce/skydive,lebauce/skydive,skydive-project/skydive,skydive-project/skydive,skydive-project/skydive,lebauce/skydive