allow settings logging level via a sys config in unit tests

Pipe in the `tests.es.logger.level` system property to the log4j config file used in tests. We still default to info. Also adapts the logger name to use the first letter of packages.

Author: bleskes

test/framework/src/main/resources/log4j2-test.properties

@@ -3,7 +3,8 @@ status = error
 appender.console.type = Console
 appender.console.name = console
 appender.console.layout.type = PatternLayout
-appender.console.layout.pattern = [%d{ISO8601}][%-5p][%-25c] %marker%m%n
+appender.console.layout.pattern = [%d{ISO8601}][%-5p][%-25c{1.}] %marker%m%n
 
-rootLogger.level = info
+rootLogger.level = ${sys:tests.es.logger.level:-info}
 rootLogger.appenderRef.console.ref = console
+                                                                                                   e