SSDM-9413 Configured logging to a file.

microservice_server_template/build.gradle

...microservices/download/server/startup/ServerLauncher.java

...rvice_server_template/src/main/resources/log4j.properties

openbis_statistics_server/build.gradle

...oservices/download/server/services/store/PingHandler.java

...load/server/services/store/StatisticsReceiverHandler.java

...microservices/download/server/startup/StatisticsMain.java

...is_statistics_server/src/main/resources/log4j2.properties