Update the Jenkins API that we develop against from 1.534 to 1.554. Also, removed the "ui-sample-plugin" and "maven-plugin" since they are not used.
Update the Jenkins API that we develop against from 1.534 to 1.554. Also, removed the "ui-sample-plugin" and "maven-plugin" since they are not used.

jenkinsci/coverity-plugin,jenkinsci/coverity-plugin,jenkinsci/coverity-plugin,jenkinsci/coverity-plugin