Singularity Conda destination

[bgruening]

This destination should enable conda resolved tools inside a singularity container.

  <destination id="condor_singularity_with_conda" runner="condor">
      <param id="singularity_enabled">true</param>
       <param id="container">
           <container type="singularity" shell="/bin/bash" resolve_dependencies="true">/data/0/cvmfs/singularity/python:2.7.12--1</container>
        </param>
  </destination>

Its tested locally and works, as soon as we can get this deployed we can start with a bunch of tools and test more complicated once, like tools with data managers and so on.