improved IT with more test-case coverage

git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1636100 13f79535-47bb-0310-9956-ffa450edef68
[MTOOLCHAINS-10] Improved plugin output

git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1636103 13f79535-47bb-0310-9956-ffa450edef68
[MTOOLCHAINS-11] double check toochain type to protect against core bug MNG-5716

git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1636117 13f79535-47bb-0310-9956-ffa450edef68
improved output: differentiate no toolchain found vs no matching toolchain

git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1636122 13f79535-47bb-0310-9956-ffa450edef68