versionbits: Add support for delayed activation

test/functional/rpc_blockchain.py

@@ -149,6 +149,7 @@ class BlockchainTest(BitcoinTestFramework):
                         'count': 57,
                         'possible': True,
                     },
+                    'min_activation_height': 0,
                 },
                 'active': False
             },
@@ -158,7 +159,8 @@ class BlockchainTest(BitcoinTestFramework):
                     'status': 'active',
                     'start_time': -1,
                     'timeout': 9223372036854775807,
-                    'since': 0
+                    'since': 0,
+                    'min_activation_height': 0,
                 },
                 'height': 0,
                 'active': True