Push packages from diverse maintainers

[Linus Walleij <triad df lth se>]

So these kind of things are usually done from inside Red Hat I think. 
Basically:

* I maintain libmtp and gnomad2

* Aurelien maintains Amarok

* We need to rebuild libmtp, then gnomad2 and Amarok to pick up the new
  .soversion of libmtp.

So how do we *best* coordinate this? I have tagged everything for libmtp 
and gnomad2 in the F-8 branch, and requested that Aurelien build them and 
Amarok at the same time and then push all three. See:
https://bugzilla.redhat.com/show_bug.cgi?id=359401

We did this before, on "you build that then I will quickly build this" 
with some breakage as a result (this clearly only works if you're on the 
same geographical location as the person pushing things to testing/updates 
or we will have "race conditions"), but how do we do it *properly* in 
order to build push all three packages simultaneously to testing and then 
to updates?

Q: Does the new permissions system hinder Aurelien from building my
   packages, unless explicitly granted rights? (That'd suck.)

Q: Can Aurelien push my packages if I build them myself? (Looks like he
   can't.)

Q: Is some third person supposed to interfere?

This is the kind of thing I think would be brilliant to solve in Bodhi, 
some elegant way.

Linus