pom: scala-reflect depenencies

1) Currently we are using a Milestone release of scala test rather than
the most recent actual release. With this patch this is changed to use
the release 2.0 of scalatest_2.10.

2) scalatest has a hard coded dependency to scala-reflect 2.10.0
The current version of scala-reflect is together with scala-library and
scala compiler version 2.10.3.
This patch adds a dependency entry for scala-reflect 2.10.3 to
dependencyManagement.

Acked-by: Gerd
Target: trunk
Require-book: no
Require-notes: no