Adding deb/postrm to recreate /opt if it is removed by dpkg
Adding deb/postrm to recreate /opt if it is removed by dpkg

Change-Id: Ic52fd90ab4726c88e395da3621f392d5155866d8

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