[sitescripts] Use the correct buildtools revision when creating nightlies

[fhd]

Background

createNightlies.py is currently calling directly into buildtools (referenced as a submodule) to create nightly builds.

The problem with this is that this will always use the revision of buildtools linked in sitescripts - not the one linked in the respective project (e.g. adblockpluschrome).

What to change

There are multiple ways to achieve this, but I think the cleanest one is to stop calling into buildtools directly, and to call a script (e.g. the project's build.py) instead - moving the release build logic from createNightlies.py to that one.

[fhd]

Please set it to ready if you agree Wladimir. Also feel free to adjust the priority: I felt this should at least be P3 since it causes problems in practice.

[trev]

I was under the impression that we use hg archive instead of cloning repositories for development build generation - but apparently we do the latter in order to get the dependencies. That means that we can call build.py instead of packager.createBuild(), there will be no performance difference. We can also replace the build.generateDocs() call the same way.

This will still cause some inconsistencies, we cannot really avoid using a different buildtools copy to get the metadata - but I guess that's better than the current state.

[kvas]

@sebastian, @tlucas: Is this ticket still relevant? If so, should it be moved to Automation module or is it actually Sitescripts?

[tlucas]

Closing this ticket, since abpssembly is currently calling the target repository buildtools.build.py directly.