fix flake8 errors

Author: zancas

conftest.py

@@ -62,7 +62,6 @@ def json(self):
     monkeypatch.setattr('f5.bigip.iControlRESTSession', fakesessionclass)
 
 
-
 @pytest.fixture
 def fakeicontrolsessionfactory(monkeypatch):
     class Response(object):
@@ -87,6 +86,7 @@ def _session_factory(**json_keys):
 
     return _session_factory
 
+
 @pytest.fixture
 def fakeicontrolsession_v12(monkeypatch):
     class Response(object):

f5/bigip/mixins.py

@@ -144,24 +144,6 @@ def _is_version_supported_method(container, method_version):
                         tmos_v, method_version)
             raise UnsupportedTmosVersion(error)
 
-    def _is_version_supported_method(container, method_version):
-        """Helper method
-
-         To use in instances where class methods on some resources
-         require a specific TMOS version to run.
-
-        Raises::
-                UnsupportedTmosVersion
-        """
-        tmos_v = container._meta_data['bigip'].tmos_version
-        if LooseVersion(tmos_v) < LooseVersion(method_version):
-            error = "There was an attempt to use a method which " \
-                    "has not been implemented or supported " \
-                    "in the device's TMOS version: %s. " \
-                    "Minimum TMOS version supported is %s" % (
-                        tmos_v, method_version)
-            raise UnsupportedTmosVersion(error)
-
 
 class ExclusiveAttributesMixin(object):
     """Overrides ``__setattr__`` to remove exclusive attrs from the object."""