Fix pylint's warning invalid-name.

setup.cfg

@@ -31,3 +31,18 @@ per-file-ignores =
 [pydocstyle]
 inherit = false
 ignore = D1,D212,D203
+[pylint.BASIC]
+good-names = ex, i, j, k, Run, _, e, x, dn, cn, ip, os, unicode
+
+[pylint.IMPORTS]
+ignored-modules =
+    ansible.module_utils.ansible_freeipa_module,
+    ipalib, ipalib.config, ipalib.constants, ipalib.krb_utils, ipalib.errors,
+    ipapython.ipautil, ipapython.dn, ipapython.version, ipapython.dnsutil,
+    ipaplatform.paths
+
+[pylint.REFACTORING]
+max-nested-blocks = 9
+
+[pylint.FORMAT]
+max-line-length = 80