Create a virtual private cloud on Amazon's Web services configured
        for deploying JupyterHubs.

def create_vpc(self):
        """Create a virtual private cloud on Amazon's Web services configured
        for deploying JupyterHubs.
        """
        self.create_stack(
            self.vpc_name,
            'amazon-eks-vpc.yaml',
            parameters=define_parameters(
                VpcBlock="10.42.0.0/16",
                Subnet01Block="10.42.1.0/24",
                Subnet02Block="10.42.2.0/24",
                Subnet03Block="10.42.3.0/24"
            )
        )