OAK-699, OAK-684 - added DefaultOakSolrProvider with OakSolrNodeStateConfiguration to start an EmbeddedSolrServer reading configuration from the node state, OakSolrConfiguration now holds information about the core to be used

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1456065 13f79535-47bb-0310-9956-ffa450edef68