Exclude run of theses ITs as MNG-5366 is still unresolved.

git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1605047 13f79535-47bb-0310-9956-ffa450edef68
[MJAR-178]
 - Fixed documentation on fron page with hint 
   to Maven Jarsigner Plugin


git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1605053 13f79535-47bb-0310-9956-ffa450edef68