improve dist-git commit summary line during "rdopkg patch" with >1 patches

[ktdreyer]

When I have two or more pending commits on my -patches branch, rdopkg will create a dist-git commit with a title that is the final commit's title.

For example, when rdopkg patch generates three patches for me, the dist-git commit looks like this:

commit 4d4db38ec07fe4c29d80564f2110429e972b7839
Author: Ken Dreyer <kdreyer@redhat.com>
Date:   Wed Jan 11 14:54:00 2017 -0700

    Third nice commit

    Changelog:
    - Third nice commit
    - A second awesome commit
    - My first cool commit

The Third nice commit title there should be something more general, because it might have nothing to do with the first or second changes, and it's misleading when browsing quickly through the dist-git logs.

I'm not sure how to make this idempotent with rdopkg amend, though. Maybe Third nice commit (and 2 others) or something? I welcome other ideas!

[ktdreyer]

We could make the dist-git commit title simply the new NVR of the package at that point?

In other words:

• if %changelog has a single entry, use that as the commit title (rdopkg's current behavior)
• if %changelog has multiple entries, simply title the commit with the package's NVR

[yazug]

I like this idea and then along with issue #118 third option would be to specify a commit title on the command line

[yac]

https://review.rdoproject.org/r/#/c/6529/