Unify naming of loggers in citrus

[tschlat]

Citrus Version
3.1 (applies to current version of Citrus-Simulator as well)

Expected behavior
Usage of loggers should be unique over all classes and modules

Actual behavior
Currently loggers are instantiated in different ways:
E.g.

private static final Logger LOG = LoggerFactory.getLogger(TestContext.class);
private static Logger log = LoggerFactory.getLogger(CitrusVersion.class);

I would propose to use the following definition:

private static final Logger log = LoggerFactory.getLogger(CitrusVersion.class);

According to Java Coding Conventions (Chapter 3.3) the log is not a constant and should therefore not be capitalized, although it is static final.

[bbortt]

agree on this solution.

[bbortt]

in the same turn, we should look to replace usages of String#format with the logger implementation of the parameter replacing.