ACCUMULO-1214 document delay between set/get properties; loosen the test to allow for the delay

git-svn-id: https://svn.apache.org/repos/asf/accumulo/branches/1.5@1463546 13f79535-47bb-0310-9956-ffa450edef68
ACCUMULO-1214 document delay between set/get properties; loosen the test to allow for the delay

git-svn-id: https://svn.apache.org/repos/asf/accumulo/trunk@1463547 13f79535-47bb-0310-9956-ffa450edef68