Let the developer configure desired logging with system properties

Now by default, Wildfly logs at ERROR level in the CONSOLE and DEBUG level in
the project.build.directory/test.log file.

For this to happen, we need to copy a the /src/test/wildfly-resources file (filtered)
to the Wildfly standalone configuration directory during the process-test-classes phase.

Example:
mvn verify -Dwildfly.logging.console.level=DEBUG

Also:
* removed useless <id>Memory-backend</id> profile definition (it is the default)
* removed redundant info in Cassandra-backend profile