PeerFinder work and refactoring:

* Implement PeerFinder business logic.
* Support fixed peers (including DNS support).
* Add journal support to Peer and Peers.
* Refactor PeerDoor support.
* Tidy up Peers and eliminate connection functionality and timers.
* Refactor Peer interface and add journal support.
* Allow construction of incoming Peer using an existing socket.
* Remove TESTNET support.
* Allow connections from/to cluster peers without consuming slots
* Misc. cleanups.

src/ripple_data/protocol/HashPrefix.h

@@ -68,15 +68,6 @@ struct HashPrefix
 
     // proposal for signing
     static uint32 const proposal            = 0x50525000; // 'PRP'
-
-    // inner transaction to sign (TESTNET)
-    static uint32 const txSignTestnet       = 0x73747800; // 'stx'
-
-    // validation for signing (TESTNET)
-    static uint32 const validationTestnet   = 0x76616C00; // 'val'
-
-    // proposal for signing (TESTNET)
-    static uint32 const proposalTestnet     = 0x70727000; // 'prp'
 };
 
 #endif

src/ripple_data/protocol/ripple.proto

@@ -244,12 +244,12 @@ message TMPeers
 // An Endpoint describes a network peer that can accept incoming connections
 message TMEndpoint
 {
-    required TMIPv4EndPoint ipv4 = 1;
-    required uint32         hops = 2;
-    required uint32         slots = 3;         // the number of available incoming slots
-    required uint32         maxSlots = 4;      // the maximum number of incoming slots
-    required uint32         uptimeSeconds = 5; // uptime in seconds
-    required string         features = 6;
+    required TMIPv4EndPoint ipv4    = 1;
+    required uint32         hops    = 2;
+    
+    // This field is used to allow the TMEndpoint message format to be modified
+    // as necessary in the future. 
+    required uint32         version = 3;
 }
 
 // An array of Endpoint messages