Make sure the order for location in ENTERING_MAINTENANCE state

DatanodeInfoWithStorage[] di = lb.getLocations();
// Move decommissioned/stale datanodes to the bottom
Arrays.sort(di, comparator);

// Sort nodes by network distance only for located blocks
int lastActiveIndex = di.length - 1;
while (lastActiveIndex > 0 && isInactive(di[lastActiveIndex])) {
  --lastActiveIndex;
}
int activeLen = lastActiveIndex + 1;
if(nonDatanodeReader) {
  networktopology.sortByDistanceUsingNetworkLocation(client,
      lb.getLocations(), activeLen, createSecondaryNodeSorter());
} else {
  networktopology.sortByDistance(client, lb.getLocations(), activeLen,
      createSecondaryNodeSorter());
}