Fix RPC tests that require wallet encryption

qa/rpc-tests/keypool.py

@@ -98,7 +98,7 @@ def main():
             os.makedirs(options.tmpdir)
         initialize_chain(options.tmpdir)
 
-        nodes = start_nodes(1, options.tmpdir)
+        nodes = start_nodes(1, options.tmpdir, extra_args=[['-developerencryptwallet']])
 
         run_test(nodes, options.tmpdir)
 

qa/rpc-tests/wallet_nullifiers.py

@@ -10,6 +10,10 @@ from time import *
 
 class WalletNullifiersTest (BitcoinTestFramework):
 
+    def setup_nodes(self):
+        return start_nodes(4, self.options.tmpdir,
+                           extra_args=[['-developerencryptwallet']] * 4)
+
     def run_test (self):
         # add zaddr to node 0
         myzaddr0 = self.nodes[0].z_getnewaddress()