Check consensus hash consistency (RIPD-1456):

These changes use the hash of the consensus transaction set when
characterizing the mismatch between a locally built ledger and fully
validated network ledger. This allows detection of non-determinism in
transaction process, in which consensus succeeded, but a node somehow
generated a different subsequent ledger.

src/ripple/protocol/STValidation.h

@@ -88,6 +88,7 @@ public:
         signed before sharing with other nodes.
 
         @param ledgerHash The hash of the validated ledger
+        @param consensusHash The hash of the consensus transaction set
         @param signTime When the validation is signed
         @param publicKey The current signing public key
         @param nodeID ID corresponding to node's public master key
@@ -97,6 +98,7 @@ public:
 
     STValidation(
         uint256 const& ledgerHash,
+        uint256 const& consensusHash,
         NetClock::time_point signTime,
         PublicKey const& publicKey,
         NodeID const& nodeID,
@@ -114,9 +116,14 @@ public:
         return emplace(n, buf, std::move(*this));
     }
 
+    // Hash of the validated ledger
     uint256
     getLedgerHash() const;
 
+    // Hash of consensus transaction set used to generate ledger
+    uint256
+    getConsensusHash() const;
+
     NetClock::time_point
     getSignTime() const;
 

src/ripple/protocol/impl/STValidation.cpp

@@ -28,6 +28,7 @@ namespace ripple {
 
 STValidation::STValidation(
     uint256 const& ledgerHash,
+    uint256 const& consensusHash,
     NetClock::time_point signTime,
     PublicKey const& publicKey,
     NodeID const& nodeID,
@@ -36,6 +37,7 @@ STValidation::STValidation(
 {
     // Does not sign
     setFieldH256 (sfLedgerHash, ledgerHash);
+    setFieldH256 (sfConsensusHash, consensusHash);
     setFieldU32 (sfSigningTime, signTime.time_since_epoch().count());
 
     setFieldVL (sfSigningPubKey, publicKey.slice());
@@ -65,6 +67,11 @@ uint256 STValidation::getLedgerHash () const
     return getFieldH256 (sfLedgerHash);
 }
 
+uint256 STValidation::getConsensusHash () const
+{
+    return getFieldH256 (sfConsensusHash);
+}
+
 NetClock::time_point
 STValidation::getSignTime () const
 {