test: refactor functional tests to use restart_node

test/functional/wallet_reorgsrestore.py

@@ -77,8 +77,7 @@ class ReorgsRestoreTest(BitcoinTestFramework):
         assert_equal(conflicted["walletconflicts"][0], conflicting["txid"])
 
         # Node0 wallet is shutdown
-        self.stop_node(0)
-        self.start_node(0)
+        self.restart_node(0)
 
         # The block chain re-orgs and the tx is included in a different block
         self.nodes[1].generate(9)