[subscriptions]: Set format uri instead of url for sink

[maxl2287]

What type of PR is this?

Add one of the following kinds:

• correction

What this PR does / why we need it:

Sets the format for sink to uri.

Which issue(s) this PR fixes:

Fixes #269

[dfischer-tech]

LGTM 🐈‍⬛

[bigludo7]

As the we have already released these 3 APIs with this version I guess we cannot change them?
We need to move back to wip and then craft a new release no?

[eric-murray]

Ideally, a separate PR resetting all version numbers to WIP would be merged first before this one (and any others)

I would not patch the previous release as it only affects the API response, and hence has no impact on clients. It can wait for the next release.

[akoshunyadi]

I think the fastest way would be to change the versions in the 3 affected files to wip here

[bigludo7]

I think the fastest way would be to change the versions in the 3 affected files to wip here

Works for me as we discussed during previous meeting to not switch all yaml to wip as we were not sure to update them for next release.

[maxl2287]

@camaraproject/device-status_codeowners I have updated the touched APIs to version vwip

[bigludo7]

LGTM

[maxl2287]

@akoshunyadi I'll close this PR, as it's moved out into the new repositories.