[maven-release-plugin] copy for tag 5.5.1

Fixes where abandoned spans were not reported to zipkin (openzipkin#832)

There was a slight logic glitch found by @tutufool which prevented spans
accidentally abandoned from being reported to zipkin. Nice detective
work!

Fixes openzipkin#831

[maven-release-plugin] copy for tag 5.5.0

[maven-release-plugin] copy for tag 5.4.4

Kafka Streams Revamp and Publish (openzipkin#800)

Addresses problems where we didn't subscribe ourselves (openzipkin#814)

As mentioned by @akarnokd
> downstream.onSubscribe(this) is mandatory, even if you don't plan to support fusion. Without this, operators trying to detect the fuseable feature of their immediate upstream would interface with the wrong operator.

This also removes support for fusion until we can better handle it.

Finally, this backfills a bunch of tests

[maven-release-plugin] copy for tag 5.4.3

Fixes length bug in b3 single format

Thanks to @zyfjeff for finding this!

See envoyproxy/envoy#4712 (comment)

[maven-release-plugin] copy for tag 5.4.2

Fixes gRPC tag propagation to local spans