made a graceful sleep method

appdaemon/subsystem.py

@@ -40,6 +40,13 @@ class ADSubsystem:
     def stopping(self) -> bool:
         return self.stop.is_set()
 
+    async def sleep(self, delay: float):
+        try:
+            if not self.stopping:
+                await asyncio.sleep(delay)
+        except asyncio.CancelledError:
+                self.logger.debug('Cancelled during sleep')
+
 
 @dataclass
 class Utility(ADSubsystem):
@@ -53,10 +60,7 @@ class Utility(ADSubsystem):
     async def loop(self):
         while not self.stopping:
             self.logger.debug('Looping...')
-            try:
+            await self.sleep(self.loop_rate)
-                await asyncio.sleep(self.loop_rate)
-            except asyncio.CancelledError:
-                self.logger.debug('Cancelled during sleep')
         self.logger.debug('Stopped utility loop gracefully')
 
 
@@ -94,10 +98,8 @@ class Plugin(ADSubsystem):
 
                 # if self.state['update_count'] == 2:
                 #     raise ValueError('fake error')
-            try:
+
-                await asyncio.sleep(self.update_rate)
+            await self.sleep(self.update_rate)
-            except asyncio.CancelledError:
-                self.logger.debug('Cancelled during sleep')
         self.logger.debug('Stopped plugin updates gracefully')