Endpoint names are global

[davidsiaw]

If you create an endpoint named A in district 1, you cant make an endpoint named A in district 2, even though there is no reason you shouldn't be able to.

Possible fix

We should use the district parameter when creating an endpoint, and require that all operations on the endpoint require the district to be specified.

[davidsiaw]

We will revert #660 because it introduces an unexpected change to the way barcelona behaves.

If you go

bcn endpoint create hello -d staging

Barcelona then creates an endpoint called staging-hello.

If in the past another district test has and endpoint called staging-hello, this PR causes barcelona to either fail or worse overwrite the endpoint name (we don't know what will happen)

This PR did not resolve the global endpoint name issue and caused the above new issue, so we are reverting it.