Refactor code for build/deploy permission check

[bedroge]

There's some (almost) identical code in these checks, this could be refactored in such a way that both make use of a single function.

[jonas-lq]

This was already addressed in a later commit in #171

see:

eessi-bot-software-layer/tools/pr_comments.py

Line 84 in ceca354

def create_comment(repo_name, pr_number, comment):

)

Maybe I should have made it clearer that I actually fixed it.

[bedroge]

Ah, right, sorry, guess I misunderstood the comment and didn't check properly :-). Closing this...