- YangTools Design Guidelines
(https://wiki-archive.opendaylight.org/view/YANG_Tools:Design_and_Coding_Guidelines)
- follow JLS modifier ordering
- (http://checkstyle.sourceforge.net/config_modifier.html)
+ (https://checkstyle.sourceforge.io/checks/modifier/modifierorder.html)
- do not use underscores (_) in identifiers, as they trigger warnings with JDK8
- Uppercase " *static final Logger LOG = ...* " (See 5.2.4 examples)