[maven-release-plugin] prepare release 4.12.0

Reverts mess from failed deployment

[maven-release-plugin] copy for tag 4.11.0

Re-reads time per-trace

This moves logic such that clock readings occur once per trace. In doing
so, we get clock consistency throughout the trace, without risk of
becoming out-of-sync with NTP updates.

[maven-release-plugin] copy for tag 4.10.1

Updates to JDK 9 (openzipkin#546)

* updates circleci config
* moves maven config to enforce java 9
* fixes where retrolambda cannot backport lambdas
* works around resteasy test compatability
* fixes incorrect Nullable annotations

[maven-release-plugin] copy for tag 4.10.0

Bumps zipkin version

[maven-release-plugin] copy for tag 4.9.2

Updates to latest zipkin dependencies