title: unable to get pylint output to populate the violations graph
body: <p>my build steps:</p>
  
  <pre><code>cd $WORKSPACE
  export TERM="linux"
  . venv/bin/activate
  pylint --rcfile=pylint.cfg $(find handlers -maxdepth 1 -name "*.py" -print) &gt; pylint.log || exit 0
  </code></pre>
  
  <p>result of pylint.log:</p>
  
  <pre><code>************* Module handlers
  C:  1, 0: Missing module docstring (missing-docstring)
  C:  8, 0: Missing function docstring (missing-docstring)
  ************* Module handlers.foo
  C:  1, 0: Black listed name "foo" (blacklisted-name)
  C:  1, 0: Missing module docstring (missing-docstring)
  C:  1, 0: Missing function docstring (missing-docstring)
  E:  2,11: Undefined variable 'a' (undefined-variable)
  E:  2,13: Undefined variable 'b' (undefined-variable)
  
  
  Report
  ======
  ...
  </code></pre>
  
  <p>(the report continues with statistics by type, raw metrics, external dependencies)</p>
  
  <p>the xml filename pattern for pylint is:</p>
  
  <pre><code>**/pylint.log
  </code></pre>
  
  <p>with the source path pattern being:</p>
  
  <pre><code>**/
  </code></pre>
  
  <p>Even after all this, and with pylint.log showing I have lint errors, the graph shows nothing.</p>
  
  <p>any ideas how to get pylint and the violations plugin working nicely together?</p>