Address review nits for restart flow

Agent-Logs-Url: https://github.com/naturallaw777/staging_alpha/sessions/8e6c98f7-8b24-4ec0-944b-0310e0989495

Co-authored-by: naturallaw777 <99053422+naturallaw777@users.noreply.github.com>

app/sovran_systemsos_web/server.py

@@ -2978,7 +2978,7 @@ async def api_service_restart(unit: str):
     try:
         proc = await asyncio.create_subprocess_exec(
             "systemctl", "restart", unit,
-            stdout=asyncio.subprocess.PIPE,
+            stdout=asyncio.subprocess.DEVNULL,
             stderr=asyncio.subprocess.PIPE,
         )
         _, stderr = await proc.communicate()