Update apache karaf to version 4.2.3

Change-Id: If9aadfa2715a3f100df6e34e25789e74399759a0
diff --git a/tools/package/onos-prep-karaf b/tools/package/onos-prep-karaf
index 4b845a6..54a36ff 100755
--- a/tools/package/onos-prep-karaf
+++ b/tools/package/onos-prep-karaf
@@ -12,7 +12,7 @@
 KARAF_PATCHES=$5
 SANDBOX=${6:-.}
 
-KARAF_VERSION="4.2.2"
+KARAF_VERSION="4.2.3"
 ONOS_SECURITY_MODE="false"
 
 PREFIX="onos-$ONOS_VERSION"