Fix 1393

[aquarta]

Proposed changes

Fix missing previous values for upsert/option=update call (#1393)

Types of changes

added previousValues(inEntityP, dbAttrsP); calls in src/lib/orionld/serviceRoutines/orionldPostBatchUpsert.cpp
added a functional test

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

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[github-actions]

CLA Assistant Lite bot All contributors have signed the CLA ✍️

[sgheppy]

I have read the CLA Document and I hereby sign the CLA

[aquarta]

I think I made a mistake with commits, I will resolve this as soon as possibile

This pr is needed since the IOTagent use upsert to send measures, and this prevent to use the previosValue filed in subscription/notification when using LD

[aquarta]

I have read the CLA Document and I hereby sign the CLA

[kzangeli]

Hello there and thank you so much for contributing.
The feature "showChanges" in notifications was only partially implemented and this PR adds a little to it, so, that is very welcome!
However, I see a few of my changes in the diff - it seems you need to merge in the latest from the develop branch.

Apart from that, yesterday I noticed a problem with the docker files, a dependency package has disappeared and the build fails accordingly.
So, once this really runs, it will most probably fail, no need to worry.
A fix is on its way, a radical modification of the docker files. Hopefully today.

[kzangeli]

The dockerfile problem has been solved.
I have two queued PRs I need to merge, now that I can.
After that, if this PR is still "as is", I'll use the github button to merge what's in develop.

[kzangeli]

Thank you for the contribution, very much appreciated!

[kzangeli]

(I fixed a few very minor style-guide related issues to make the PR pass the compliance tests)