Use log4j-1.2 instead of log4j-1.2.16

/usr/share/java/log4j-1.2.jar is a symlink to the latest installed
log4j 1.2. This fixes an issue where we have log4j-1.2.17 but not 1.2.16.
Merge pull request #3 from patricklucas/use_less_specific_log4j

Use log4j-1.2 instead of log4j-1.2.16