Remove OBR legacy Ui
NX-486: remove nexus-test-environment-maven-plugin (replace with standard maven plugins plus interpolated configuration)
Manual merge of PR #606 from NEXUS-6650-nuget-proxy-403-master
Merge pull request #608 from sonatype/remove-legacy-ui-obr

REVIEW: Remove OBR legacy Ui
Merge remote-tracking branch 'origin/master' into NX-222-repositories-ui

Conflicts:
	plugins/rapture/nexus-coreui-plugin/src/main/java/org/sonatype/nexus/coreui/RepositoryStatusXO.groovy