Adding ability to balance load between different cell servers.

Adding ability to specify structure/size of the cell.

Change-Id: I2b721dac187cc1a73be2949bdb71709ad72cbb48

@@ -216,7 +216,7 @@ class Warden {
                         new ServerInfo(info.hostName) : v.bumpLoad(info)));
 
         List<ServerInfo> servers = new ArrayList<>(load.values());
-        servers.sort((a, b) -> a.load - b.load);
+        servers.sort((a, b) -> b.load - a.load);
         ServerInfo server = servers.get(0);
         return server.cells.get(random.nextInt(server.cells.size())).cellName;
     }

@@ -85,7 +85,7 @@ public class WardenTest {
         validateCellState(doltCell);
         validateSizes(4, 2);
 
-        assertTrue("cells should not be on the same host",
+        assertFalse("cells should not be on the same host",
                     Objects.equals(warden.getCellHost(dudeCell.cellName),
                                    warden.getCellHost(doltCell.cellName)));