Set default namespace for go config for configless of get/try/require

[EvanBoyle]

Fixes #4296

As far as I can tell, other languages don't expose the config-less form of get/try/require methods. Exposing these in go was probably a bug, but given that removing them would be breaking this is the next best thing.

This change reverses the logic used in the "pulumi config set" command:

pulumi/pkg/cmd/pulumi/config.go

Line 381 in 8bc3d0e

func parseConfigKey(key string) (config.Key, error) {

Given that you can't set a "namespace-less" config key, this change seems correct. Updated the integration test coverage to include this behavior.

[pgavlin]

Given that you can set a "namespace-less" config key, this change seems correct.

Should this read "cannot set a namespace-less" config key? Otherwise this is a breaking change, no?

[EvanBoyle]

@pgavlin Yes, that is a typo. You cannot set a "namespace-less" key. The code linked here automatically prepends the project if it doesn't find the separator token :

pulumi/pkg/cmd/pulumi/config.go

Line 381 in 8bc3d0e

func parseConfigKey(key string) (config.Key, error) {