DefaultConfig returns the default configuration.

DefaultEnvBlacklist is the default set of environment variables that are filtered when passing the environment variables of the host to a task.

DefaulUserBlacklist is the default set of users that tasks are not allowed to run as when using a driver in "user.checked_drivers".

DefaultUserCheckedDrivers is the set of drivers we apply the user blacklist onto.

Config is used to parameterize and configure the behavior of the client.

RPCHandler can be provided to the Client if there is a local server to avoid going over the network.