Build breakage due to checkstyle.

The change in odlparent caused build failure.
The changeset caused it is as follows.
commit f1c4e8a94515118893477c19effbaec53d4356d8
Author: Michael Vorburger <vorburger@redhat.com>
Date: Fri Nov 25 20:43:46 2016 +0100

Checkstyle suppressions XML to completely avoid checking target/

This is the only reliably way that I found to avoid checking generated
code and resources. See also e.g.
http://stackoverflow.com/questions/2362652/excluding-classes-in-maven-checkstyle-plugin-reports
and my comment on that page.

Change-Id: I8b2ec5ee6d46dc108e781031996a1022b8c5330a
Signed-off-by: Michael Vorburger <vorburger@redhat.com>