ACCUMULO-765 Marked some of the new 1.5 APIs with @since javadoc tags

git-svn-id: https://svn.apache.org/repos/asf/accumulo/branches/1.5@1456985 13f79535-47bb-0310-9956-ffa450edef68
ACCUMULO-765 Marked some of the new 1.5 APIs with @since javadoc tags

git-svn-id: https://svn.apache.org/repos/asf/accumulo/trunk@1456986 13f79535-47bb-0310-9956-ffa450edef68