Implement fair channel allocation in ChanKeep

* Allocate channels to relays only if they have free space based on
their chanlimit value
* Minify channels by removing ones that are already covered before
passing them off to be joined

modules/provision.py

@@ -65,7 +65,6 @@ def provisionRelay(num, network):
 def provisionMultipleRelays(net, relaysNeeded):
     for i in range(relaysNeeded):
         num, alias = main.network[net].add_relay()
-        print(relaysNeeded, "for", net, ":", num, alias)
         provisionRelay(num, net)
     main.saveConf("network")