[maven-release-plugin] prepare release java-sdk-3.0.0-RC1
[maven-release-plugin] prepare release java-sdk-3.0.0-RC1

supunucsc/java-sdk,m2fd/java-sdk,JoshSharpe/java-sdk,supunucsc/java-sdk,watson-developer-cloud/java-sdk,JoshSharpe/java-sdk,m2fd/java-sdk,supunucsc/java-sdk,watson-developer-cloud/java-sdk,m2fd/java-sdk,watson-developer-cloud/java-sdk,watson-developer-cloud/java-sdk,JoshSharpe/java-sdk