Enable javac lint.
Enable javac lint.

- disabling serial ID related warning.

Change-Id: I5556c53367c2022baaf4b5fb7c3298cb4a8f9573

opennetworkinglab/spring-open,opennetworkinglab/spring-open,opennetworkinglab/spring-open,opennetworkinglab/spring-open,opennetworkinglab/spring-open,opennetworkinglab/spring-open