RFR: Improve merge bot commit message

[Erik Helin]

On Wed, 5 Feb 2020 11:34:23 GMT, Jorn Vernee <jvernee at openjdk.org> wrote:

> The current commit message the merge bot uses just says
> 
>> Merge
> 
> I'd like it if the message contained the branches involved as well, to be a little more informative. This patch changes the message to for instance:
> 
>> Merge branch: 'branchA' into: 'branchB'

How about "Automatic merge of <branch-a> into <branch-b>"? Just to make it clear that the merge was done automatically.

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PR: https://git.openjdk.java.net/skara/pull/400