More flake8 fixes

Author: assrinivasan

tests/mocked_libs/sonic_platform_base/__init__.py

@@ -1 +1 @@
-
+#  noqa : W391

tests/mocked_libs/sonic_platform_base/sonic_ssd/ssd_base.py

@@ -17,4 +17,4 @@ def get_temperature(self):
         return 3000
 
     def get_vendor_output(self):
-        return 'SONiC Test'
+        return 'SONiC Test'

tests/mocked_libs/sonic_platform_base/sonic_ssd/ssd_generic.py

@@ -17,4 +17,4 @@ def get_temperature(self):
         return 3000
 
     def get_vendor_output(self):
-        return 'SONiC Test'
+        return 'SONiC Test'