[fedora-arm] Another repository verification check that would be useful

[Daniel Drake]

perl-Coro built in armv7hl stage3 but failed in stage4, and hence is
only present in stage3.

Packages like filelight then were then built successfully into stage4
pulling on perl-Coro from stage3.

armv5tel build efforts have cloned stage4's RPM set, but not stage3.
So we currently are not attempting to build perl-Coro (since no SRPM
appears in stage4), and packages which depend on this (like filelight)
are failing at the first hurdle.

It would be really useful if someone could look into the perl-Coro
failure, and it would be even more useful if someone could write a
script that identifies packages that were built in stage3 but not in
stage4.

Thanks,
Daniel