download karaf 4.2.1 from maven central

Change-Id: Icb7e0400ee5b34ed4be33afdda5074a6f6ec1f6d
diff --git a/tools/test/bin/onos-check-bits b/tools/test/bin/onos-check-bits
index 1196e27..ed7bb7c 100755
--- a/tools/test/bin/onos-check-bits
+++ b/tools/test/bin/onos-check-bits
@@ -32,7 +32,7 @@
   echo "ONOS archive does not contain the proper version file" && exit 1
 fi
 
-tar tzf ${ONOS_TAR} | grep -q apache-karaf-3.0.8
+tar tzf ${ONOS_TAR} | grep -q apache-karaf-4.2.1
 if [ $? -ne 0 ]; then
   echo "ONOS archive does not contain karaf" && exit 1
 fi