What was changed

Remove check for address in config. Allows for users to call to_client_connect_config and override this value themselves. The Client.connect call already does this validation for us.

Makes it easy in the general case where users just want to do:

config = ClientConfig.load_client_connect_config()
config.setdefault("target_host", "localhost:7233")
Client.connect(**config)

2. How was this tested:
   No tests

3. Any docs updates needed?
   No