[Commotion-admin] [commotiond] MDP fixes (#68)

[hawkinswnaf]

Fixes discovered when testing mdp. 
You can merge this Pull Request by running:

  git pull https://github.com/hawkinswnaf/commotiond plugins

Or you can view, comment on it, or merge it online at:

  https://github.com/opentechinstitute/commotiond/pull/68

-- Commit Summary --

  * Fixup casting and () issues
  * MDP plugin sends instance path first
  * Send back only the signature.

-- File Changes --

    M plugins/serval-dna/crypto.c (10)
    M src/tree.c (4)

-- Patch Links --

https://github.com/opentechinstitute/commotiond/pull/68.patch
https://github.com/opentechinstitute/commotiond/pull/68.diff
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