This removes all package imports for packages including and below `scala.util.parsing`, even if bnd / maven-bundle-plugin thinks, it is required. I added this exclusion rule based on @huitseeker last comment (after he talked with @phaller about that):
> practical consequences for this PR:
> * strict versioning ([===, ===]) AND resolution:= optional for scala -xml seems the best option
> * you can remove the scala-parser-combinators dependency

Although, I have to admit, that I pretty much prefer to leave it there but mark it optional, like I did with `scala.xml` packages. In general, I trust bnd's bytecode analysis, which means, there must be a real dependency to `scala.util.parsing` somewhere, and without knowing details, I rather would not prohibit the import of it.

In the current published scala-compiler bundle, there **is** a non-optional import for `scala.util.parsing`, but without any version constraints.

It's your call.