REST authentication in opticalUtil
REST authentication in opticalUtil

Environment variables are checked before falling back on and exporting
tentatively chosen defaults.

Change-Id: If378127a2cc757b55024aeb89cb1964f8641d5a6

donNewtonAlpha/onos,VinodKumarS-Huawei/ietf96yang,Shashikanth-Huawei/bmp,oplinkoms/onos,planoAccess/clonedONOS,gkatsikas/onos,chenxiuyang/onos,kkkane/ONOS,oplinkoms/onos,lsinfo3/onos,oplinkoms/onos,y-higuchi/onos,castroflavio/onos,maheshraju-Huawei/actn,maheshraju-Huawei/actn,gkatsikas/onos,castroflavio/onos,sdnwiselab/onos,osinstom/onos,sdnwiselab/onos,osinstom/onos,kkkane/ONOS,kuujo/onos,lsinfo3/onos,sonu283304/onos,kkkane/ONOS,osinstom/onos,opennetworkinglab/onos,kuujo/onos,mengmoya/onos,chenxiuyang/onos,LorenzReinhart/ONOSnew,gkatsikas/onos,Shashikanth-Huawei/bmp,donNewtonAlpha/onos,gkatsikas/onos,kuujo/onos,sdnwiselab/onos,sdnwiselab/onos,donNewtonAlpha/onos,y-higuchi/onos,kuujo/onos,donNewtonAlpha/onos,castroflavio/onos,osinstom/onos,maheshraju-Huawei/actn,kuujo/onos,opennetworkinglab/onos,VinodKumarS-Huawei/ietf96yang,sdnwiselab/onos,lsinfo3/onos,sonu283304/onos,opennetworkinglab/onos,gkatsikas/onos,y-higuchi/onos,gkatsikas/onos,LorenzReinhart/ONOSnew,y-higuchi/onos,y-higuchi/onos,VinodKumarS-Huawei/ietf96yang,VinodKumarS-Huawei/ietf96yang,sdnwiselab/onos,opennetworkinglab/onos,castroflavio/onos,osinstom/onos,oplinkoms/onos,sonu283304/onos,oplinkoms/onos,VinodKumarS-Huawei/ietf96yang,mengmoya/onos,zsh2938/onos,planoAccess/clonedONOS,mengmoya/onos,zsh2938/onos,oplinkoms/onos,LorenzReinhart/ONOSnew,Shashikanth-Huawei/bmp,opennetworkinglab/onos,LorenzReinhart/ONOSnew,kuujo/onos,mengmoya/onos,zsh2938/onos,opennetworkinglab/onos,maheshraju-Huawei/actn,LorenzReinhart/ONOSnew,planoAccess/clonedONOS,kkkane/ONOS,Shashikanth-Huawei/bmp,lsinfo3/onos,chenxiuyang/onos,zsh2938/onos,sonu283304/onos,oplinkoms/onos,Shashikanth-Huawei/bmp,kuujo/onos,planoAccess/clonedONOS,donNewtonAlpha/onos,chenxiuyang/onos,maheshraju-Huawei/actn,mengmoya/onos