This commit adds a new consul:kv resource which allows us to set and
watch keys inside a consul kv datastore.
This was started by roidelapluie, and was finished during pair
programming with purpleidea.
Signed-off-by: Julien Pivotto <roidelapluie@inuits.eu>
Signed-off-by: James Shubin <james@shubin.ca>
