Add plug-in fragment as test plug-in for the UI (#68)

Added a fragment that connects to the host which is the UI.
Removed the server shutdown at the SpotterServiceClientTest which caused
trouble during testing phase.
Added first unit test for Eclipse UI.

Change-Id: I0d925510e6a75d5293025aab1ad9a84b9b80d6e3
Signed-off-by: Denis Knoepfle <denis.knoepfle@sap.com>