RFE: SLF4J_LOGGER_NAMING

[vorburger]

A new check named something like RFE: SLF4J_LOGGER_NAMING which, by default, would validate that a Logger field is named LOG (if it's static) and logger (?) if it's not, but leave the name customizable through configuration (if SpotBugs/FindBugs allows configuration for indidivual detectors?), could be sweet...

FYI also https://github.com/opendaylight/yangtools/blob/master/common/checkstyle-logging/src/main/java/org/opendaylight/yangtools/checkstyle/LoggerVariableNameCheck.java