Remove unused TravisCI and Jenkinsfile
This PR removes the unused TravisCI config and test Jenkinsfile.
Notify: @NUWAN.KUMARASIRI @TREFILEK @bjsousa
On December 29, GitLab will be migrating to the next generation Container Registry, which implements automatic garbage collection. See KB news article for edge cases in which you could need to rebuild a container after the migration.
This PR removes the unused TravisCI config and test Jenkinsfile.
Notify: @NUWAN.KUMARASIRI @TREFILEK @bjsousa