Fixed cell definition to override ONOS_USER env. var.
Fixed cell definition to override ONOS_USER env. var.

Change-Id: If30c5cceac211cf7a38ec474750bd08335ccc77a

y-higuchi/onos,osinstom/onos,gkatsikas/onos,oplinkoms/onos,Shashikanth-Huawei/bmp,kuujo/onos,gkatsikas/onos,opennetworkinglab/onos,osinstom/onos,oplinkoms/onos,maheshraju-Huawei/actn,maheshraju-Huawei/actn,LorenzReinhart/ONOSnew,gkatsikas/onos,LorenzReinhart/ONOSnew,osinstom/onos,sdnwiselab/onos,lsinfo3/onos,kuujo/onos,maheshraju-Huawei/actn,Shashikanth-Huawei/bmp,maheshraju-Huawei/actn,VinodKumarS-Huawei/ietf96yang,kuujo/onos,opennetworkinglab/onos,opennetworkinglab/onos,kuujo/onos,lsinfo3/onos,opennetworkinglab/onos,sdnwiselab/onos,y-higuchi/onos,donNewtonAlpha/onos,gkatsikas/onos,opennetworkinglab/onos,VinodKumarS-Huawei/ietf96yang,y-higuchi/onos,LorenzReinhart/ONOSnew,LorenzReinhart/ONOSnew,mengmoya/onos,oplinkoms/onos,gkatsikas/onos,oplinkoms/onos,sdnwiselab/onos,mengmoya/onos,y-higuchi/onos,opennetworkinglab/onos,donNewtonAlpha/onos,mengmoya/onos,maheshraju-Huawei/actn,kuujo/onos,mengmoya/onos,oplinkoms/onos,lsinfo3/onos,donNewtonAlpha/onos,osinstom/onos,donNewtonAlpha/onos,y-higuchi/onos,VinodKumarS-Huawei/ietf96yang,Shashikanth-Huawei/bmp,Shashikanth-Huawei/bmp,gkatsikas/onos,sdnwiselab/onos,sdnwiselab/onos,sdnwiselab/onos,oplinkoms/onos,oplinkoms/onos,kuujo/onos,VinodKumarS-Huawei/ietf96yang,VinodKumarS-Huawei/ietf96yang,osinstom/onos,mengmoya/onos,Shashikanth-Huawei/bmp,kuujo/onos,LorenzReinhart/ONOSnew,donNewtonAlpha/onos,lsinfo3/onos