Use COINBASE_MATURITY constant in functional tests.

test/functional/rpc_createmultisig.py

@@ -9,6 +9,7 @@ import itertools
 import json
 import os
 
+from test_framework.blocktools import COINBASE_MATURITY
 from test_framework.authproxy import JSONRPCException
 from test_framework.descriptors import descsum_create, drop_origins
 from test_framework.key import ECPubKey, ECKey
@@ -109,7 +110,7 @@ class RpcCreateMultiSigTest(BitcoinTestFramework):
 
     def checkbalances(self):
         node0, node1, node2 = self.nodes
-        node0.generate(100)
+        node0.generate(COINBASE_MATURITY)
         self.sync_all()
 
         bal0 = node0.getbalance()