Enable policy enforcing GetMedianTimePast as the end point of lock-time constraints

Transactions are not allowed in the memory pool or selected for inclusion in a block until their lock times exceed chainActive.Tip()->GetMedianTimePast(). However blocks including transactions which are only mature under the old rules are still accepted; this is *not* the soft-fork required to actually rely on the new constraint in production.

src/consensus/consensus.h

@@ -20,6 +20,6 @@ enum {
 };
 
 /** Used as the flags parameter to CheckFinalTx() in non-consensus code */
-static const unsigned int STANDARD_LOCKTIME_VERIFY_FLAGS = 0;
+static const unsigned int STANDARD_LOCKTIME_VERIFY_FLAGS = LOCKTIME_MEDIAN_TIME_PAST;
 
 #endif // BITCOIN_CONSENSUS_CONSENSUS_H

src/test/miner_tests.cpp

@@ -223,7 +223,7 @@ BOOST_AUTO_TEST_CASE(CreateNewBlock_validity)
     tx.nLockTime = chainActive.Tip()->nHeight+1;
     hash = tx.GetHash();
     mempool.addUnchecked(hash, CTxMemPoolEntry(tx, 11, GetTime(), 111.0, 11));
-    BOOST_CHECK(!CheckFinalTx(tx));
+    BOOST_CHECK(!CheckFinalTx(tx, LOCKTIME_MEDIAN_TIME_PAST));
 
     // time locked
     tx2.vin.resize(1);
@@ -237,7 +237,7 @@ BOOST_AUTO_TEST_CASE(CreateNewBlock_validity)
     tx2.nLockTime = chainActive.Tip()->GetMedianTimePast()+1;
     hash = tx2.GetHash();
     mempool.addUnchecked(hash, CTxMemPoolEntry(tx2, 11, GetTime(), 111.0, 11));
-    BOOST_CHECK(!CheckFinalTx(tx2));
+    BOOST_CHECK(!CheckFinalTx(tx2, LOCKTIME_MEDIAN_TIME_PAST));
 
     BOOST_CHECK(pblocktemplate = CreateNewBlock(scriptPubKey));
 
@@ -255,7 +255,7 @@ BOOST_AUTO_TEST_CASE(CreateNewBlock_validity)
     //BOOST_CHECK(CheckFinalTx(tx2));
 
     BOOST_CHECK(pblocktemplate = CreateNewBlock(scriptPubKey));
-    BOOST_CHECK_EQUAL(pblocktemplate->block.vtx.size(), 3);
+    BOOST_CHECK_EQUAL(pblocktemplate->block.vtx.size(), 2);
     delete pblocktemplate;
 
     chainActive.Tip()->nHeight--;