create v6 client controller

[danoswaltCL]

Release 6.0 will have some breaking changes, particularly the userId header. Currently those changes are to the v5 controller.

Changes needed:

• In dev (6.0) the v5 controller needs to be converted to v6.
• Client libraries should be pointed to v6.
• We need the v5 controller to match what is on the release 5.2 branch (current production).
• We need to remove user-ids from the request body for all client api's as it should be passed as a request header User-Id and attached in the request from the UserCheckMiddleware.

Dev note - add the version prefix to the swagger annotations. Make sure it's there in both remaining controllers so that both versions of each endpoint show up on the swagger web interface.

[danoswaltCL]

Will Qa

[danoswaltCL]

Bug referred to in #1657 , I moved that one back, it's related to this also though, when that is fixed I'll retest