Add checking minDepth parameter
Add checking minDepth parameter

- If minDepth is defined in distribution options, distribution goes on
for at least to that depth
- Last level of distribute nodes is used if not enough levels is defined

uh-cs-iotlab/solmuhub,uh-cs-iotlab/node-iothub,uh-cs-iotlab/solmuhub,uh-cs-iotlab/node-iothub