Use in dict rather than "in dict.keys()". Fix linting warnings about "not in". (#8298)

* Fixed a few linting warnings for if not x in y.

These should have been caught by pylint, but weren't.

* Replaced "x in y.keys()" with "x in y".

It's much faster, and more Pythonic.

certbot/certbot/_internal/storage.py

@@ -127,7 +127,7 @@ def write_renewal_config(o_filename, n_filename, archive_dir, target, relevant_d
 
     config["renewalparams"].update(relevant_data)
 
-    for k in config["renewalparams"].keys():
+    for k in config["renewalparams"]:
         if k not in relevant_data:
             del config["renewalparams"][k]
 

certbot/certbot/plugins/storage.py

@@ -106,7 +106,7 @@ class PluginStorage(object):
         if not self._initialized:
             self._initialize_storage()
 
-        if not self._classkey in self._data.keys():
+        if self._classkey not in self._data:
             self._data[self._classkey] = {}
         self._data[self._classkey][key] = value