Add log4j configuration to enable logging

This helps to analyse potential issues with running the tests.
Increase log level of loggers for more tracing.

Setting
log4j.logger.org.testcontainers=DEBUG
helped to find out why update to newer version of testcontainers didn't
work (NoClassDefFoundError). It turned out we need to add the dependency
com.github.docker-java:docker-java-transport-zerodep
which is required since testcontainers 1.16.

Change-Id: I9b8da7a3fb0187fe00408902da3da5cac56a9673

src/test/resources/log4j.properties

diff --git a/src/test/resources/log4j.properties b/src/test/resources/log4j.properties
new file mode 100644
index 0000000..2f33b7f
--- /dev/null
+++ b/src/test/resources/log4j.properties
@@ -0,0 +1,9 @@
+log4j.rootLogger=ERROR, MAIN
+log4j.appender.MAIN=org.apache.log4j.ConsoleAppender
+log4j.appender.MAIN.layout=org.apache.log4j.PatternLayout
+log4j.appender.MAIN.layout.ConversionPattern=%r [%t] %-5p %c %x - %m%n
+
+log4j.logger.org.testcontainers=INFO
+log4j.logger.tc=INFO
+log4j.logger.com.github.dockerjava=WARN
+log4j.logger.com.github.dockerjava.zerodep.shaded.org.apache.hc.client5.http.wire=OFF