Improve Python code: address unused variables (#11049)

* Address F841 (unused variable).

* Reformat.

* Add changelog fragment.

* More cleanup.

* Remove trailing whitespace.

* Readd removed code as a comment with TODO.

plugins/modules/jenkins_build.py

@@ -212,7 +212,7 @@ class JenkinsBuild:
         try:
             response = self.server.get_build_info(self.name, self.build_number)
             return response
-        except jenkins.JenkinsException as e:
+        except jenkins.JenkinsException:
             response = {}
             response["result"] = "ABSENT"
             return response