Add log4j.properties to all testng classpaths

As in 916e4532c4c5, add the tools directory to the classpath
for testng execution so that log4j.properties can be found.

Also perform some minor cleanups.
Remove slf4j-log4j12 from all components

As in 5fea921a33ea0, remove slf4j-log4j12 from the runtime
classpath properties to prevent warnings about multiple
implementations.