Fix for #631: Include org.osgi.service.metatype.annotations package in bndlib

An import package for org.osgi.service.metatype.annotations was left
in bndlib rather than just including the package. This causes bndtools
to fail to resolve in Eclipse because bndlib could not be resolved.

Signed-off-by: BJ Hargrave <bj@bjhargrave.com>