ofoverlay-renderer failure in jdk8

groupbasedpolicy seems to fail to build when using JDK8.

See:

https://jenkins.opendaylight.org/releng/job/autorelease-daily-lithium-jdk8/47/org.opendaylight.groupbasedpolicy$ofoverlay-renderer/consoleFull

Additional logs:

https://jenkins.opendaylight.org/releng/job/autorelease-daily-lithium-jdk8/47/console

Snippet:

[ERROR] Exit code: 1 - /opt/jenkins/workspace/autorelease-daily-lithium-jdk8/groupbasedpolicy/renderers/ofoverlay/target/generated-sources/config/org/opendaylight/controller/config/yang/config/ofoverlay_provider/impl/OFOverlayProviderModuleMXBean.java:22: warning: no @param for gbpOfoverlayTableOffset
[ERROR] public void setGbpOfoverlayTableOffset(java.lang.Integer gbpOfoverlayTableOffset);
[ERROR] ^
[ERROR] /opt/jenkins/workspace/autorelease-daily-lithium-jdk8/groupbasedpolicy/renderers/ofoverlay/src/main/java/org/opendaylight/groupbasedpolicy/renderer/ofoverlay/EndpointManager.java:286: error: identifier expected
[ERROR] * @param
[ERROR] ^
[ERROR] /opt/jenkins/workspace/autorelease-daily-lithium-jdk8/groupbasedpolicy/renderers/ofoverlay/src/main/java/org/opendaylight/groupbasedpolicy/renderer/ofoverlay/EndpointManager.java:315: error: identifier expected
[ERROR] * @param
[ERROR] ^
[ERROR] /opt/jenkins/workspace/autorelease-daily-lithium-jdk8/groupbasedpolicy/renderers/ofoverlay/src/main/java/org/opendaylight/groupbasedpolicy/renderer/ofoverlay/EndpointManager.java:330: error: identifier expected
[ERROR] * @param
[ERROR] ^