pylint: fix some issues before making it fatal

Change-Id: I337c5f82cae2644910cd106f5aa9f6e390f39bf3

Author: Staphylo

arista/drivers/scd/watchdog.py

@@ -33,15 +33,15 @@ def write(self):
          return
       try:
          self.localStorage.writeObj(self)
-      except Exception:
+      except (IOError, OSError):
          logging.error("failed to write watchdog state to cache")
 
    def read(self):
       if self.localStorage is None or inSimulation():
          return
       try:
          self.localStorage.readObj(self)
-      except Exception:
+      except (IOError, OSError):
          logging.error("failed to read watchdog state from cache")
 
    def arm(self, timeout):

arista/platforms/catalina.py

@@ -1,4 +1,3 @@
-from ..core.hwapi import HwApi
 from ..core.fixed import FixedSystem
 from ..core.platform import registerPlatform
 from ..core.port import PortLayout

arista/utils/sonic_platform/fan_drawer.py

@@ -43,7 +43,7 @@ def get_status_led(self, color=None):
    def set_status_led(self, color):
       led = self._slot.getLed()
       if led is None:
-          return True
+         return True
       try:
          led.setColor(color)
          return True