cd to ONOS_HOME before starting ONOS
cd to ONOS_HOME before starting ONOS

Change-Id: I3d8251518c00f76dd30cd0f3756a99a98023e059

opennetworkinglab/spring-open,opennetworkinglab/spring-open,opennetworkinglab/spring-open,opennetworkinglab/spring-open,opennetworkinglab/spring-open,opennetworkinglab/spring-open