Don't use vlans from devices. Use explicitly specified VLAN. BVS-187

src/main/java/net/floodlightcontroller/flowcache/FCQueryObj.java

@@ -52,11 +52,7 @@ public class FCQueryObj {
         if (vlan != null) {
         	this.vlans = new Short[] { vlan };
         } else {
-	        if (srcDevice != null) {
-	        	this.vlans = srcDevice.getVlanId();
-	        } else if (dstDevice != null) {
-	            this.vlans = dstDevice.getVlanId();
-	        }
+            this.vlans = null;
         }
     }