Bump karaf version to 4.2.5

Change-Id: Ib03f6f11e923f38f6d9a2a36f170f17addbbb290
diff --git a/tools/package/deb/prerm b/tools/package/deb/prerm
index 9d3aa62..f98e133 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-4.2.3/
+rm -rf /opt/onos/apache-karaf-4.2.5/
 rm -rf /opt/onos/var/*
 rm -rf /opt/onos/config
 rm -rf /opt/onos/options