python: Use isinstance() instead of type()

CI testing fails while running flake8 on python scripts with the
message "./python/semanage/seobject.py:250:16: E721 do not compare
types, for exact checks use `is` / `is not`, for instance checks use
`isinstance()`"

Use "isinstance(args, str)" instead of "type(args) == str"

Signed-off-by: James Carter <jwcart2@gmail.com>

python/semanage/seobject.py

@@ -247,7 +247,7 @@ class semanageRecords:
         global handle
         if args:
             # legacy code - args was store originally
-            if type(args) == str:
+            if isinstance(args, str):
                 self.store = args
             else:
                 self.args = args