ClientFilter has no way to skip/ignore tracing certain client calls

[pavolloffay]

The ClientFilter traces every client call made. It would be very beneficial if certain client calls were ignored / skipped.

This could be done in a manner similar to how io.opentracing.contrib.web.servlet.filter.TracingFilter (io.opentracing.contrib : opentracing-web-servlet-filter) can be constructed with a skip pattern to allow certain incoming requests to not be traced.

See the original issue: jaegertracing/jaeger-client-java#289