Johannes Wienke 5d6b4ef73f Support older checkstyle versions
The output format used by older checkstyle versions differs from the one
of new versions. This commit adds a second parsing iteration on the
output lines with a suitable pattern to support both versions in
parallel. Due to the differences in the order of matching groups this is
hard to achieve in a single pass through the output lines.

An appropriate test case is added.
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