[KARAF-2511] Review and update the provisioning page of the user guide

git-svn-id: https://svn.apache.org/repos/asf/karaf/trunk@1548150 13f79535-47bb-0310-9956-ffa450edef68
[KARAF-2511] Add urls and OBR pages in the user guide

git-svn-id: https://svn.apache.org/repos/asf/karaf/trunk@1548151 13f79535-47bb-0310-9956-ffa450edef68