[CONFIG] checkstyle: member naming. Allow a single char.

Author: Gonzalo Diaz

config/checkstyle/checkstyle.xml

@@ -185,7 +185,7 @@
              value="Type name ''{0}'' must match pattern ''{1}''."/>
     </module>
     <module name="MemberName">
-      <property name="format" value="^[_]*[a-z][a-z0-9][a-zA-Z0-9]*$"/>
+      <property name="format" value="^[_]*[a-z][a-zA-Z0-9]*$"/>
       <message key="name.invalidPattern"
              value="Member name ''{0}'' must match pattern ''{1}''."/>
     </module>