[maven-release-plugin] prepare release docker-commons-1.0-alpha-6
[maven-release-plugin] prepare release docker-commons-1.0-alpha-6

shinji62/docker-commons-plugin,shinji62/docker-commons-plugin,ndeloof/docker-commons-plugin,oleg-nenashev/docker-commons-plugin,jenkinsci/docker-commons-plugin,oleg-nenashev/docker-commons-plugin,jenkinsci/docker-commons-plugin,ndeloof/docker-commons-plugin,jenkinsci/docker-commons-plugin