Send auth token to CAS in `bgd execute`

Adam Coldrickrequested to merge
sotk/bugs/send-auth-token-to-all-urls into master

Description

When the Execution and CAS services are separate, currently the bgd execute command only passes the authentication token (if specified) to the Execution service. This makes it impossible to use a separate URL for CAS with authentication enabled.

This MR fixes this by passing the auth token when creating both channels, rather than just the Execution service channel.

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