[MPLUGIN-281] Removed dependency plexus-container-default:1.0-alpha-9-stable-1

git-svn-id: https://svn.apache.org/repos/asf/maven/plugin-tools/trunk@1647380 13f79535-47bb-0310-9956-ffa450edef68
[MPLUGIN-283] Upgrade plexus-utils to 3.0.20

git-svn-id: https://svn.apache.org/repos/asf/maven/plugin-tools/trunk@1647381 13f79535-47bb-0310-9956-ffa450edef68