Bump karaf version to 4.2.5

Change-Id: Ib03f6f11e923f38f6d9a2a36f170f17addbbb290
diff --git a/tools/package/onos-prep-karaf b/tools/package/onos-prep-karaf
index 54a36ff..1fb51a3 100755
--- a/tools/package/onos-prep-karaf
+++ b/tools/package/onos-prep-karaf
@@ -12,7 +12,7 @@
 KARAF_PATCHES=$5
 SANDBOX=${6:-.}
 
-KARAF_VERSION="4.2.3"
+KARAF_VERSION="4.2.5"
 ONOS_SECURITY_MODE="false"
 
 PREFIX="onos-$ONOS_VERSION"