add speed logic

[gignsky]

Add logic to activate nodes based on configuration file speed note (slow, normal, fast)

i.e. if the lowest node (server-node) is marked as slow and more work than that node can handle appears replace that node with faster nodes even if it won't activate to max nodes limit

so if there are 5 transcodes in the queue and the server node is active, deactivate the server node and activate node's a and b rather than using just server-node and node-a as this will improve the speed with which things are processed, this might prove to be more trouble than it is worth though