Remove BundleDelegatingClassLoader.

  - As answered in the link below, there is a way to get the actual ClassLoader used for a Bundle. Thanks to how the ClassLoaderContextSelector works, we can't really use a delegating ClassLoader.
  - http://stackoverflow.com/questions/1503304/how-to-get-classloader-for-a-bundle-in-equinox

git-svn-id: https://svn.apache.org/repos/asf/logging/log4j/log4j2/trunk@1612178 13f79535-47bb-0310-9956-ffa450edef68
Remove inner class in bundle activator.

git-svn-id: https://svn.apache.org/repos/asf/logging/log4j/log4j2/trunk@1612179 13f79535-47bb-0310-9956-ffa450edef68