[PAXEXAM-538] Move OSGi TestNG tests to regression matrix
[PAXEXAM-538] disabled some tests for Knopflerfish
[PAXEXAM-538] propagate system properties
moved DS test bundle to samples
moved PDE bundle to samples
deleted it-regression folder, updated reactor POM
unified POM names
adapted to changed artifactId
[PAXEXAM-530] added jcommander dependency
[PAXEXAM-538] reenabled Knopflerfish

The problem was that two OSGi implementations were on the classpath.
[PAXEXAM-538] removed duplicate test container
[PAXEXAM-538] fixed test for Forked Container
removed unused imports
[PAXEXAM-523] do not clutter source directory in tests
use Surefire 2.15 for better error messages
[PAXEXAM-511] allow overriding Karaf version for tests in
exam.properties
removed wagon-ssh-external plugin
[maven-release-plugin] prepare release exam-reactor-3.1.0
[maven-release-plugin] prepare for next development iteration
updated test POM versions to 3.1.1-SNAPSHOT