Add Context object to Bind requests (OSBAPI)

[NickyMateev]

Add Context object to Bind requests

This pull request addresses the issue where a bind operation for a specific service instance does not include the Context object (as specified in the OSBAPI spec) in the request to the broker.

The change was fairly simple and required to add similar logic like the one in controller_instange.go to controller_binding.go.

Old tests have been fixed.

Closes: #2283

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[carolynvs]

/ok-to-test

[carolynvs]

/lgtm

Nice catch! Thank you for plumbing in the context for bindings. 👍

[NickyMateev]

@carolynvs I've signed the CLA, but for whatever reason the respective CLA check doesn't pass. Any suggestions?

Update: Scratch that. The moment I made the comment, the CLA check passed! :)

[MHBauer]

/assign @MHBauer

[MHBauer]

@NickyMateev Thanks for taking this on.
/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: MHBauer

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