test: refactor functional tests to use restart_node

test/functional/wallet_hd.py

@@ -103,8 +103,7 @@ class WalletHDTest(BitcoinTestFramework):
         self.sync_all()
 
         # Needs rescan
-        self.stop_node(1)
-        self.start_node(1, extra_args=self.extra_args[1] + ['-rescan'])
+        self.restart_node(1, extra_args=self.extra_args[1] + ['-rescan'])
         assert_equal(self.nodes[1].getbalance(), NUM_HD_ADDS + 1)
 
         # Try a RPC based rescan
@@ -183,8 +182,7 @@ class WalletHDTest(BitcoinTestFramework):
             self.nodes[0].generate(10)
             # Restart node 1 with keypool of 3 and a different wallet
             self.nodes[1].createwallet(wallet_name='origin', blank=True)
-            self.stop_node(1)
-            self.start_node(1, extra_args=['-keypool=3', '-wallet=origin'])
+            self.restart_node(1, extra_args=['-keypool=3', '-wallet=origin'])
             connect_nodes(self.nodes[0], 1)
 
             # sethdseed restoring and seeing txs to addresses out of the keypool