Refactor AAAShiroProvider & Co. to be non static

Refactor AAAShiroProvider & Co. to be non static

- The IdmLightApplication is now instantiated and injected
  with the AAAShiroProvider and passed to the ServletContainer
  instead of the ServletContainer instantiating it via reflection.

- For KarafIniWebEnvironmentLoaderListener and KarafIniWebEnvironment,
  the initial plan was to inject the AAAShiroProvider however there
  are still web.xml files in ODL land that reference
  KarafIniWebEnvironment and expect a no-arg ctor. We need to keep
  backwards compatibility for a while so I'll follow-up later
  to add a new KarafIniWebEnvironmentLoaderListener that is advertised
  as a service for programmtic use. KarafIniWebEnvironment was changed
  to obtain the ShiroConfiguration statically rather than the
  AAAShiroProvider.

- The shiro lib still instantiates the filter/realm etc instances via
  reflection. These are specified via String key/value pairs with class names
  in the Ini instance. Unfortunately I see no way around this. So
  to avoid having to pass our services, eg DataBroker, via statics,
  I opted to use ThreadLocals to inject indirectly. This is a bit
  ugly but works.

Change-Id: I8f5114802c76cbd2b4bfda69952df2b28557cf8d
Signed-off-by: Michael Vorburger <vorburger@redhat.com>
Signed-off-by: Tom Pantelis <tompantelis@gmail.com>