[tests] Set -deprecatedrpc=accounts in tests

Future commits will deprecate the accounts RPC methods, arguments and
return objects. Set the -deprecatedrpc=accounts switch now so tests
don't break in intermediate commits.

test/functional/wallet_keypool_topup.py

@@ -25,7 +25,7 @@ class KeypoolRestoreTest(BitcoinTestFramework):
     def set_test_params(self):
         self.setup_clean_chain = True
         self.num_nodes = 2
-        self.extra_args = [[], ['-keypool=100', '-keypoolmin=20']]
+        self.extra_args = [['-deprecatedrpc=accounts'], ['-deprecatedrpc=accounts', '-keypool=100', '-keypoolmin=20']]
 
     def run_test(self):
         wallet_path = os.path.join(self.nodes[1].datadir, "regtest", "wallets", "wallet.dat")