Use :: for library separation

[hhorak]

https://google.github.io/styleguide/shell.xml#Function_Names suggests to use :: separator for libraries separation, so we can end up with something like:

ct::os::print_logs "some"

instead of

ct_os_print_logs "some"

[praiskup]

It's not portable shell idiom, and so I don't like that (as a lot of things in that document).
OTOH, if we feel it is worth it... we don't care much about portability in this project, so
I have no strong opinion.

[hhorak]

I wanted just to hear more opinions, not that I'd push on that either. Thanks for the feedback so far, I'd keep this open to see more feedback, but I agree that without a good reason to change it, it's not worth it.

[omron93]

In my point of view, portability of this project isn't so important. But I'm also thinking if the readability of the new format is so better, that it makes sense to rewrite tests for several images...

[pkubatrh]

Imo the readability improves by a bit but I do not think it is worth the change, considering we would need to change all of the images to the new format (or keep both for compatibility I guess)

[hhorak]

I agree it's not worth it, closing.