* do not cache ACL storage contract
* when error comes before initialization
* initial KeyServerSet commit
* update_nodes_set in maintain
* do not connect to self
* fixed connection establishing
* removed println
* improved KeyServerSet tracing
* moved parsing to KeyServerSet
* re-read only when blockchain is changed
* do not try to connect if not a part of cluster
* improved logging
* fixed tests
* NodeKeyPAir trait
* fixed parity to use new trait
* continue integrating with parity
* updated parity for NodeKeyPair
* completed KeyStoreNodeKeyPair
* removed comment
* removed dependency && style
