Allow longer method names

Older versions of Pylint (<2.1.0) limited the names of various things
to 30 characters. We allowed up to 35 characters for method name due
to pre-existing identifiers.

Modern versions of Pylint no longer have an upper limit. Let's not be
pickier than Pylint's default configuration.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>

.pylintrc

@@ -15,9 +15,9 @@ bad-functions=input
 # [missing-docstring]
 docstring-min-length=10
 
-# Allow longer methods than the default.
+# No upper limit on method names. Pylint <2.1.0 has an upper limit of 30.
 # [invalid-name]
-method-rgx=[a-z_][a-z0-9_]{2,35}$
+method-rgx=[a-z_][a-z0-9_]{2,}$
 
 # Allow module names containing a dash (but no underscore or uppercase letter).
 # They are whole programs, not meant to be included by another module.