Revert "test-network: drop ExecReload= in networkd.service and udevd.service"

The required change is in v253 but not in any older releases, so this
test change needs to be reverted.

This reverts commit 27c9d9b.

Author: bluca

test/test-network/systemd-networkd-tests.py

@@ -372,12 +372,17 @@ def create_unit_dropin(unit, contents):
     with open(f'/run/systemd/system/{unit}.d/00-override.conf', mode='w', encoding='utf-8') as f:
         f.write('\n'.join(contents))
 
-def create_service_dropin(service, command, additional_settings=None):
+def create_service_dropin(service, command, reload_command=None, additional_settings=None):
     drop_in = [
         '[Service]',
         'ExecStart=',
         f'ExecStart=!!{valgrind_cmd}{command}',
     ]
+    if reload_command:
+        drop_in += [
+            'ExecReload=',
+            f'ExecReload={valgrind_cmd}{reload_command}',
+        ]
     if enable_debug:
         drop_in += ['Environment=SYSTEMD_LOG_LEVEL=debug']
     if asan_options:
@@ -695,6 +700,7 @@ def setUpModule():
     save_timezone()
 
     create_service_dropin('systemd-networkd', networkd_bin,
+                          f'{networkctl_bin} reload',
                           ['[Service]', 'Restart=no', '[Unit]', 'StartLimitIntervalSec=0'])
     create_service_dropin('systemd-resolved', resolved_bin)
     create_service_dropin('systemd-timesyncd', timesyncd_bin)
@@ -708,6 +714,8 @@ def setUpModule():
             '[Service]',
             'ExecStart=',
             f'ExecStart=!!{udevd_bin}',
+            'ExecReload=',
+            f'ExecReload={udevadm_bin} control --reload --timeout 0',
         ]
     )
     create_unit_dropin(