Upgrade ONOS to karaf version 4.2.6

Change-Id: I9d4086378ee42c65e8865bd1172107767bdc028d
diff --git a/tools/test/bin/onos-check-bits b/tools/test/bin/onos-check-bits
index 931dd6c..be1b8da 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-4.2.5
+tar tzf ${ONOS_TAR} | grep -q apache-karaf-4.2.6
 if [ $? -ne 0 ]; then
   echo "ONOS archive does not contain karaf" && exit 1
 fi
diff --git a/tools/test/scenarios/odtn/README.md b/tools/test/scenarios/odtn/README.md
index 9993852..6dbdcce 100644
--- a/tools/test/scenarios/odtn/README.md
+++ b/tools/test/scenarios/odtn/README.md
@@ -14,7 +14,7 @@
 export OCI=172.17.0.5
 export ONOS_INSTANCES="172.17.0.5 172.17.0.6 172.17.0.7"
 export ONOS_USER=root
-export ONOS_INSTALL_DIR=/root/onos/apache-karaf-4.2.5/data
+export ONOS_INSTALL_DIR=/root/onos/apache-karaf-4.2.6/data
 ```
 
 Besides, the access for each onos container are very easy (`source /tmp/odtn/OCvar` firstly):