Upgrade to apache karaf 4.2.9

Change-Id: Id42b0b0893ee81cb54a50bf6c76da024a9a2d2a8
diff --git a/tools/package/deb/prerm b/tools/package/deb/prerm
index 7c7106e..c688faa 100755
--- a/tools/package/deb/prerm
+++ b/tools/package/deb/prerm
@@ -14,7 +14,7 @@
 
 # Clean up onos runtime directories
 #      TODO don't hardcode karaf version
-rm -rf /opt/onos/apache-karaf-4.2.8/
+rm -rf /opt/onos/apache-karaf-4.2.9/
 rm -rf /opt/onos/var/*
 rm -rf /opt/onos/config
 rm -rf /opt/onos/options