as an SDC developer,

I want to extend the automatic testing to include UI testing,

so that we will have a more stable application

DOD:

1. add UI testing capabilities to our sanity docker by changing the docker os and adding Selenium.
2. leverage the existing java selanuem tests already available in the SDC code base.
3. the selanuem tests should run as a separate suit in the nightly execution.
4. the option to run this tests should be available in a local env as well
5. define a subset of tests to run as part of the onap nightly.
6. the tests are running nightly as part of the CSIT.