[maven-release-plugin] rollback changes from release preparation of v…

…2.0.0-beta3-RC1

[maven-release-plugin] copy for tag v2.0.0-beta3-RC1

Dataflow SDK for Java, Version 2.0.0-beta2

[maven-release-plugin] copy for tag v2.0.0-beta2-RC1

Dataflow SDK for Java, Version 2.0.0-beta1

Dataflow SDK for Java, version 1.9.0

[maven-release-plugin] copy for tag v2.0.0-beta1-RC3

[maven-release-plugin] copy for tag v2.0.0-beta1-RC2

[maven-release-plugin] copy for tag v2.0.0-beta1-RC1

v1.8.1 of the Dataflow SDK for Java