Use client_id in logout request

[aduth]

Pairs with (blocked by) 18F/identity-idp#7017 (I put together these changes to test that pull request, figured I may as well make a pull request)

[mitchellhenke]

👍🏼

[aduth]

@mitchellhenke Do you have a sense when these changes will be safe to merge? Is the feature flag that's checked in 18F/identity-idp#7017 already available in all the environments we're deploying this sample app?

[mitchellhenke]

@mitchellhenke Do you have a sense when these changes will be safe to merge? Is the feature flag that's checked in 18F/identity-idp#7017 already available in all the environments we're deploying this sample app?

It should be enabled in production today, and I opened 18F/identity-idp#7052 to enable it everywhere else too.

[aduth]

It should be enabled in production today, and I opened 18F/identity-idp#7052 to enable it everywhere else too.

Ok I'll plan to wait 'til that pull request is merged, so that it doesn't cause issues for local development.

[mitchellhenke]

This is good to go