Server runtime injection optimizations.

- Removed need to inject Ref<ContainerRequest> into UriRoutingContext.
- ServerBinder made package-private.
- Removed HttpContext from internal injection API.

Change-Id: Iecacf1efa0023310a35eb91341d3678f2af80963
Signed-off-by: Marek Potociar <marek.potociar@oracle.com>