FELIX-3226 Improve HttpContext whiteboard support
  - export constants
  - allow for sharing HttpContext services across bundles
    (must be declared)
  - delay Servlet/Filter registration as long as HttpContext
    service referred to is missing
  - add unit tests
FELIX-2882 service instance as key
  - replace the service instances by the service reference
    as the key of the mappings

git-svn-id: https://svn.apache.org/repos/asf/felix/trunk@1210612 13f79535-47bb-0310-9956-ffa450edef68
19 files changed