Dependency updates  * netty -> 4.1.17.Final    bugfixes, performance  * jaeger-core -> 0.21.0    thrift bugfixes, zipkin improvements
Dependency updates
 * netty -> 4.1.17.Final
   bugfixes, performance
 * jaeger-core -> 0.21.0
   thrift bugfixes, zipkin improvements

uber/tchannel-java,uber/tchannel-java