scripted-diff: Rename rpc_timewait to rpc_timeout

-BEGIN VERIFY SCRIPT-
sed -i -e 's/self.rpc_timewait/self.rpc_timeout/g' $(git grep -l self.rpc_timewait)
-END VERIFY SCRIPT-

test/functional/wallet_groups.py

@@ -21,7 +21,7 @@ class WalletGroupTest(BitcoinTestFramework):
         self.setup_clean_chain = True
         self.num_nodes = 3
         self.extra_args = [[], [], ['-avoidpartialspends']]
-        self.rpc_timewait = 120
+        self.rpc_timeout = 120
 
     def skip_test_if_missing_module(self):
         self.skip_if_no_wallet()