Phosphorus Formal Release Approval

Build logs are here :
https://logs.opendaylight.org/releng/vex-yul-odl-jenkins-1/autorelease-release-phosphorus-mvn35-openjdk11/221/

this distro:

https://nexus.opendaylight.org/content/repositories//autorelease-5285/org/opendaylight/integration/karaf/0.15.0/karaf-0.15.0.zip

this distribution test:
https://jenkins.opendaylight.org/releng/view/autorelease/job/integration-distribution-test-phosphorus/181/

this mri test:

https://jenkins.opendaylight.org/releng/view/autorelease/job/integration-distribution-mri-test-phosphorus/40/