Move has_emeter to device level for multiple plug outlets (#41)

kasa/smartstrip.py

@@ -45,10 +45,6 @@ class SmartStrip(SmartDevice):
     and should be handled by the user of the library.
     """
 
-    def has_emeter(self) -> bool:
-        """Return True as strips has always an emeter."""
-        return True
-
     def __init__(self, host: str, *, cache_ttl: int = 3) -> None:
         super().__init__(host=host)
         self.emeter_type = "emeter"
@@ -281,12 +277,6 @@ class SmartStripPlug(SmartPlug):
         """
         return f"{self.mac}_{self.child_id}"
 
-    @property  # type: ignore
-    @requires_update
-    def has_emeter(self):
-        """Single sockets have always an emeter."""
-        return True
-
     @property  # type: ignore
     @requires_update
     def alias(self) -> str: