tools: Add runtime log4j setup to engine-config

1) Moves default log4j.xml for engine-config into tools.jar
2) By default logging is off
3) Adds --log-file which sets file to write logging messages into
4) Adds --log-level which sets logging level for logger specified
   with --log-file (it's set to INFO by default)
5) Adds --log4j-config which sets filename or URL with custom
   log4j.xml file to setup logging

Change-Id: I328a018ef1b714c6a90d1b219dcd326a16bcab2d
Bug-Url: https://bugzilla.redhat.com/1063901
Signed-off-by: Martin Perina <mperina@redhat.com>