ACCUMULO-1126 Made AGC clean up unrefed sorted walogs.  Also made it delete unrefed walogs of offline servers.

git-svn-id: https://svn.apache.org/repos/asf/accumulo/branches/1.5@1451386 13f79535-47bb-0310-9956-ffa450edef68
ACCUMULO-1126 Made AGC clean up unrefed sorted walogs.  Also made it delete unrefed walogs of offline servers.

git-svn-id: https://svn.apache.org/repos/asf/accumulo/trunk@1451388 13f79535-47bb-0310-9956-ffa450edef68