LUCENE-4358: Maven configuration: revert removal of Apache snapshot repo declaration in the grandparent POM, and add a clause to disable snapshots.
LUCENE-4358: Maven configuration: revert removal of Apache snapshot repo declaration in the grandparent POM, and add a clause to disable snapshots.

git-svn-id: 308d55f399f3bd9aa0560a10e81a003040006c48@1380993 13f79535-47bb-0310-9956-ffa450edef68

apache/solr,apache/solr,apache/solr,apache/solr,apache/solr