FELIX-4483 - make osgi-bundlecontext available in init methods:

- make the bundle context available to the servlet/filter's init methods
  to ensure they can operate nicely in a OSGi context. Thanks to Bob P. 
  for providing the patch.



git-svn-id: https://svn.apache.org/repos/asf/felix/trunk@1587624 13f79535-47bb-0310-9956-ffa450edef68