Removed expired jvm flag -XX:+UseCGroupMemoryLimitForHeap from trace service

[damc-dev]

It appears that the openzipkin/zipkin docker image in the docker hub was upgraded to Java 11 and the -XX:+UseCGroupMemoryLimitForHeap is no longer a valid option. I believe it just needs to be removed.
The startup error is

tracing-server       | Unrecognized VM option 'UseCGroupMemoryLimitForHeap'
tracing-server       | Error: Could not create the Java Virtual Machine.
tracing-server       | Error: A fatal exception has occurred. Program will exit.

[arey]

Your're right: the Zikkin Docker image uses Java 11 from Google distroless: https://github.com/openzipkin/docker-zipkin/blob/master/zipkin/Dockerfile

[arey]

Thank you @damc-dev