title: SonarQube - Coverity c# plugin issue
body: <p>I'm having a problem after adding Coverity plugin into SonarQube. I get this plugin (the only Coverity plugin I found) from <a href="https://github.com/coverity/coverity-sonar-plugin" rel="nofollow">this</a>. When testing the plugin, I ran into this one:</p>
  
  <pre><code>java.lang.IllegalArgumentException: Multiple entries with same key: cs=C# and cs=C#
  </code></pre>
  
  <p>The only way Sonar continues to run (by many times I have researched) is to delete this plugin or the C# plugin. Our projects require Quality Profiles from both of these, so is there any way these two stay together without causing any issues (like Java Profiles)? My thanks in advance.</p>
  
  <p>P/s: This happens to all SonarQube versions from 5.1 to 5.6 (which I tested) and all C# plugins regardless of version.</p>