test: Assume node is running in subtests

Every (sub)test in the framework assumes the node is running, except for
the (sub)tests in this file. Remove that confusion by stopping the node
at the start of every subtest, instead of at the end.

test/functional/feature_config_args.py

@@ -19,7 +19,7 @@ def set_test_params(self):
         self.wallet_names = []
 
     def test_config_file_parser(self):
-        # Assume node is stopped
+        self.stop_node(0)
 
         inc_conf_file_path = os.path.join(self.nodes[0].datadir, 'include.conf')
         with open(os.path.join(self.nodes[0].datadir, 'bitcoin.conf'), 'a', encoding='utf-8') as conf:
@@ -89,11 +89,12 @@ def test_invalid_command_line_options(self):
         )
 
     def test_log_buffer(self):
+        self.stop_node(0)
         with self.nodes[0].assert_debug_log(expected_msgs=['Warning: parsed potentially confusing double-negative -connect=0\n']):
             self.start_node(0, extra_args=['-noconnect=0'])
-        self.stop_node(0)
 
     def test_args_log(self):
+        self.stop_node(0)
         self.log.info('Test config args logging')
         with self.nodes[0].assert_debug_log(
                 expected_msgs=[
@@ -120,37 +121,37 @@ def test_args_log(self):
                 '-rpcuser=secret-rpcuser',
                 '-torpassword=secret-torpassword',
             ])
-        self.stop_node(0)
 
     def test_networkactive(self):
         self.log.info('Test -networkactive option')
+        self.stop_node(0)
         with self.nodes[0].assert_debug_log(expected_msgs=['SetNetworkActive: true\n']):
             self.start_node(0)
-        self.stop_node(0)
 
+        self.stop_node(0)
         with self.nodes[0].assert_debug_log(expected_msgs=['SetNetworkActive: true\n']):
             self.start_node(0, extra_args=['-networkactive'])
-        self.stop_node(0)
 
+        self.stop_node(0)
         with self.nodes[0].assert_debug_log(expected_msgs=['SetNetworkActive: true\n']):
             self.start_node(0, extra_args=['-networkactive=1'])
-        self.stop_node(0)
 
+        self.stop_node(0)
         with self.nodes[0].assert_debug_log(expected_msgs=['SetNetworkActive: false\n']):
             self.start_node(0, extra_args=['-networkactive=0'])
-        self.stop_node(0)
 
+        self.stop_node(0)
         with self.nodes[0].assert_debug_log(expected_msgs=['SetNetworkActive: false\n']):
             self.start_node(0, extra_args=['-nonetworkactive'])
-        self.stop_node(0)
 
+        self.stop_node(0)
         with self.nodes[0].assert_debug_log(expected_msgs=['SetNetworkActive: false\n']):
             self.start_node(0, extra_args=['-nonetworkactive=1'])
-        self.stop_node(0)
 
     def test_seed_peers(self):
         self.log.info('Test seed peers')
         default_data_dir = self.nodes[0].datadir
+        self.stop_node(0)
 
         # No peers.dat exists and -dnsseed=1
         # We expect the node will use DNS Seeds, but Regtest mode has 0 DNS seeds
@@ -201,12 +202,9 @@ def test_seed_peers(self):
         with self.nodes[0].assert_debug_log(expected_msgs=[
                 "Adding fixed seeds as 60 seconds have passed and addrman is empty"]):
             self.nodes[0].setmocktime(start + 65)
-        self.stop_node(0)
 
 
     def run_test(self):
-        self.stop_node(0)
-
         self.test_log_buffer()
         self.test_args_log()
         self.test_seed_peers()