Updated log4j version from 1.2.13 to 1.2.17. Uses the orbit bundle.
Updated apache commons logging package from 1.1.1 to 1.2
Changed the version property name to reflect that it is an orbit version.
Merge pull request #110 from GayashanNA/log4j-update

Fixing CARBON-14970 - Update log4j and apache-commons-logging dependency