Minor opticalUtils.py patch
Minor opticalUtils.py patch

Change-Id: I03e1daf02da024c9a27baf3e1de719f36868e6f9

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