More work on refactoring and streamlining cluster infrastructure
- removed more cases of ad-hoc parsing of IP address and port - reduced code redundancy - fixed incorrect comments - removed obsolete private functions server_cluster_httpget_from_peers and server_cluster_do_httpget (replaced by acs::clusterwide)
Refactored and streamlined of cluster infrastructure
- base the API new new cluster infrastructure (including memoize-flush, server_cluster_peer_hosts, etc.) - improved handling for multiple IP addresses and IPv6 - removed assumptions of local vs. global network drivers - server_cluster_httpget_from_peers not used anymore