Upgrade Maven Deploy plugin to version 2.8.1

** Bug
   * [MDEPLOY-169] - deployAtEnd broken with parallel builds
   * [MDEPLOY-170] - Plugin configuration on module level is ignored when deployAtEnd

** Bug
     * [MDEPLOY-68] - altDeploymentRepository allows dangerous deploy  
processes
     * [MDEPLOY-145] - Documentation does not list layouts

** Improvement
     * [MDEPLOY-154] - Rewrite page 'deploy with classifier'

** New Feature
     * [MDEPLOY-157] - Add deployAtEnd option for multimodule projects

** Task
     * [MDEPLOY-151] - use maven-plugin-tools' java 5 annotations