SERVER-13645 move Consensus class into its own header and cpp file
SERVER-13645 move Member class into its own header and cpp file

also rename rs_member to the more accurate member_state
SERVER-13645 move Manager class into its own header and cpp file
SERVER-13645 move GhostSync class into its own header and cpp file
SERVER-13645 move ReplSetCommand class into its own header file
SERVER-13645 move StateBox class into its own header file
SERVER-13645 move RSBase class into its own header file
SERVER-13645 move task::Server class into a new header file in the repl directory
SERVER-13645 move rsLog into a header file
SERVER-13645 move replication_server_status.h/.cpp to repl_settings.h/.cpp
SERVER-13645 move ReplSetHealthPollTask class into its own header and cpp file