[WIP] Enable upgrading only specified repos

[utzig]

Reimplement support for newt upgrade <repo1> <repo2>.... Not specifying repos upgrades everything; specifying repos update only the ones given, without upgrading/installing its dependencies, etc.

This should allow advanced users to install only what is required, eg. if developing an app for nrf52x one could simply run:

newt upgrade --depth=1 apache-mynewt-core apache-mynewt-nimble nordic-nrfx

This is also useful for CI, eg, for MCUboot it's possible to use MCUboot as the root project and run:

newt upgrade --depth=1 apache-mynewt-core nordic-nrfx mbedtls

And this brings down the complete download from 1GB to just around 250MB.

[utzig]

Hmmm OK, CI passed now because I fixed the dependency graph when passing repo arguments to upgrade. So I'll drop the CI changes and it will break again, because there are repo arguments in the calls, even though usage is broken and upgrade totally ignores them. This probably worked back in the day when there was newt install. So, I'll have to end up adding a --no-deps parameter or something similar and which shall maintain the broken compatibility with the broken usage...

[andrzej-kaczmarek]

we also had idea to add include/exclude repo options to project.yml. this way project can be configured to only include certain repositories required for that project or exclude those not needed.

nevertheless, this one is also nice to have.

[utzig]

we also had idea to add include/exclude repo options to project.yml. this way project can be configured to only include certain repositories required for that project or exclude those not needed.

nevertheless, this one is also nice to have.

Cool, I've found some regressions when last testing this, which is the reason for the WIP. I'll try to get back to this today or tomorrow, and will leave a comment once I think it is good for review.