Creates a new database

def create(self):
        """Creates a new database"""
        self.db_attrs = self.consul.create_db(
                self.instance_name,
                self.instance_type,
                self.admin_username,
                self.admin_password,
                db_name=self.db_name,
                storage_size_gb=self.storage_size,
                timeout_s=self.launch_timeout_s,
                )