<p>Fixes discovered when testing mdp. </p>

<hr>

<h4>You can merge this Pull Request by running</h4>
<pre>  git pull https://github.com/hawkinswnaf/commotiond plugins</pre>
<p>Or view, comment on, or merge it at:</p>
<p>  <a href='https://github.com/opentechinstitute/commotiond/pull/68'>https://github.com/opentechinstitute/commotiond/pull/68</a></p>

<h4>Commit Summary</h4>
<ul>
  <li>Fixup casting and () issues</li>
  <li>MDP plugin sends instance path first</li>
  <li>Send back only the signature.</li>
</ul>

<h4>File Changes</h4>
<ul>
  <li>
    <strong>M</strong>
    <a href="https://github.com/opentechinstitute/commotiond/pull/68/files#diff-0">plugins/serval-dna/crypto.c</a>
    (10)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/opentechinstitute/commotiond/pull/68/files#diff-1">src/tree.c</a>
    (4)
  </li>
</ul>

<h4>Patch Links:</h4>
<ul>
  <li><a href='https://github.com/opentechinstitute/commotiond/pull/68.patch'>https://github.com/opentechinstitute/commotiond/pull/68.patch</a></li>
  <li><a href='https://github.com/opentechinstitute/commotiond/pull/68.diff'>https://github.com/opentechinstitute/commotiond/pull/68.diff</a></li>
</ul>