Update build to Tycho 0.17

Change-Id: I92c9757a37644ec48ed1d785f4dacd6c44276632
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

org.eclipse.jgit.packaging/pom.xml

@@ -59,7 +59,7 @@
   <name>JGit Tycho Parent</name>
 
   <properties>
-    <tycho-version>0.16.0</tycho-version>
+    <tycho-version>0.17.0</tycho-version>
     <jetty-version>7.6.0.v20120127</jetty-version>
     <args4j-version>2.0.21.v201301150030</args4j-version>
     <jsch-version>0.1.46.v201205102330</jsch-version>