[Conformance] Add tests to container

[Conformance] Add tests to container

- Add the validation repo to the k8s container
- Add the command to run the test as default in the container
- Adapt the conformance test to use the tools inside the container:
   - SSH library is removed as all the tools are inside the container
   - The test for sonobuoy and golang are no longer necessary
   - Test setup is added to check that the k8s conf file is mounted
     in the container and k8s cluster is reachable
   - Modified the test to wait for sonobuoy to finish and check
     for failures
   - Added teardown to cleanup sonobuoy containers after test is ran
   - Use absolute paths for files
   - Log all the result files in one folder that can be mounted as
     volume in the container for persistence
   - Save the sonobouy archive in the log folder

To test the changes:
   - copy /etc/kubernetes/admin.conf from k8s cluster to the jumpserver
   - run the container while mounting the admin.conf file and the
     results folder

JIRA: VAL-18

Change-Id: I8afd2e79775436538e5f3a5d54040a64e05d4c59
Signed-off-by: Cristina Pauna <cristina.pauna@enea.com>