Fix typo and warning in TestLeafQueue

a.assignContainers(clusterResource, node_0);
assertEquals(2*GB, a.getUsedResources().getMemory());
assertEquals(2*GB, app_0.getCurrentConsumption().getMemory());
assertEquals(0*GB, app_1.getCurrentConsumption().getMemory());
assertEquals(0*GB, app_0.getHeadroom().getMemory()); // User limit = 2G
assertEquals(0*GB, app_0.getHeadroom().getMemory()); // User limit = 2G

// Again one to user_0 since he hasn't exceeded user limit yet
a.assignContainers(clusterResource, node_0);
assertEquals(3*GB, a.getUsedResources().getMemory());
assertEquals(2*GB, app_0.getCurrentConsumption().getMemory());
assertEquals(1*GB, app_1.getCurrentConsumption().getMemory());
assertEquals(0*GB, app_0.getHeadroom().getMemory()); // 3G - 2G
assertEquals(0*GB, app_0.getHeadroom().getMemory()); // 3G - 2G