Revert "Update to OSGi 4.3 with use of generics for service registry. Maintains binary compatibility with pre-4.3 versions."

This reverts commit ffabd48c028061379b8e5ac5b6970ff907376f3e.
Revert "Fix pom"

This reverts commit 115151e94bfc193aa6cb77c9485a6f7eae020eeb.