Upgrade to apache karaf 4.2.9

Change-Id: Id42b0b0893ee81cb54a50bf6c76da024a9a2d2a8
diff --git a/tools/package/onos-prep-karaf b/tools/package/onos-prep-karaf
index 5660358..2653e20 100755
--- a/tools/package/onos-prep-karaf
+++ b/tools/package/onos-prep-karaf
@@ -13,7 +13,7 @@
 LOG4J2_EXTRA=$6
 SANDBOX=${7:-.}
 
-KARAF_VERSION="4.2.8"
+KARAF_VERSION="4.2.9"
 ONOS_SECURITY_MODE="false"
 
 PREFIX="onos-$ONOS_VERSION"