ut_sb_stubs.c needs a stub for CFE_SB_ZeroCopyGetPtr

[asgibson]

Is your feature request related to a problem? Please describe.
CFE_SB_ZeroCopyGetPtr does not have a stub in ut_sb_stubs.c causing undefined reference error when building unit tests for an app that uses this call.

Describe the solution you'd like
Add the stub for CFE_SB_ZeroCopyGetPtr with full context tracking.

Describe alternatives you've considered
Create my own locally in the app's unit test, but this does not help everyone.

Requester Info
Alan Gibson, NASA

[skliper]

Contribute your implementation?

[jphickey]

Probably don't need an individual issue ticket for each missing stub though.... maybe just one issue to scrub the public API and make sure we have a stub for each one?

[asgibson]

I had considered that. That seems less targeted and more likely to take extra time, whereas these are the ones I currently need, but if you really want that I will close these and create a general issue.

[astrogeco]

I think it's fine to have small issues. And I think it should be a best practice.

[jphickey]

Either way is fine but we probably should have a to-do item to scrub the public API for missing stubs, in case one was overlooked elsewhere.

[zanzaben]

fixed by #763