Validate ContainerBalancerConfiguration before start ContainerBalancer

In HDDS-6070, we did some refactoring on ContainerBalancerConfiguration, and we added a method called validateConfiguration to check the configurations. 

Currently the method returns "void", but it's more reasonable to return a boolean to indicate the validate result of the configurations.

This ticket is to change the return parameter from "void" to boolean to check the parameters before doing container balancer work.