add feature definition for gossip dist.
add feature definition for gossip dist.

Change-Id: Icf89c8c3050dc8e45ba28b261c482f689e47e1a2

lsinfo3/onos,oeeagle/onos,jinlongliu/onos,lsinfo3/onos,sdnwiselab/onos,LorenzReinhart/ONOSnew,kuangrewawa/onos,kuujo/onos,SmartInfrastructures/dreamer,packet-tracker/onos,osinstom/onos,oplinkoms/onos,Shashikanth-Huawei/bmp,kuujo/onos,kkkane/ONOS,gkatsikas/onos,oplinkoms/onos,sdnwiselab/onos,castroflavio/onos,opennetworkinglab/onos,gkatsikas/onos,sdnwiselab/onos,kuujo/onos,jinlongliu/onos,oplinkoms/onos,opennetworkinglab/onos,VinodKumarS-Huawei/ietf96yang,maheshraju-Huawei/actn,maheshraju-Huawei/actn,chinghanyu/onos,mengmoya/onos,chenxiuyang/onos,sonu283304/onos,y-higuchi/onos,mengmoya/onos,packet-tracker/onos,donNewtonAlpha/onos,lsinfo3/onos,sdnwiselab/onos,packet-tracker/onos,LorenzReinhart/ONOSnew,planoAccess/clonedONOS,kkkane/ONOS,CNlukai/onos-gerrit-test,donNewtonAlpha/onos,rvhub/onos,oplinkoms/onos,SmartInfrastructures/dreamer,sonu283304/onos,chenxiuyang/onos,y-higuchi/onos,chinghanyu/onos,oeeagle/onos,opennetworkinglab/onos,jinlongliu/onos,zsh2938/onos,gkatsikas/onos,opennetworkinglab/onos,zsh2938/onos,y-higuchi/onos,maheshraju-Huawei/actn,LorenzReinhart/ONOSnew,chenxiuyang/onos,gkatsikas/onos,kuujo/onos,kuujo/onos,planoAccess/clonedONOS,zsh2938/onos,chinghanyu/onos,packet-tracker/onos,donNewtonAlpha/onos,ravikumaran2015/ravikumaran201504,donNewtonAlpha/onos,maheshraju-Huawei/actn,VinodKumarS-Huawei/ietf96yang,jinlongliu/onos,jmiserez/onos,opennetworkinglab/onos,planoAccess/clonedONOS,castroflavio/onos,sonu283304/onos,ravikumaran2015/ravikumaran201504,sdnwiselab/onos,maheshraju-Huawei/actn,jmiserez/onos,kuujo/onos,ravikumaran2015/ravikumaran201504,rvhub/onos,rvhub/onos,opennetworkinglab/onos,LorenzReinhart/ONOSnew,jmiserez/onos,Shashikanth-Huawei/bmp,VinodKumarS-Huawei/ietf96yang,osinstom/onos,VinodKumarS-Huawei/ietf96yang,kuangrewawa/onos,oplinkoms/onos,VinodKumarS-Huawei/ietf96yang,jmiserez/onos,rvhub/onos,chenxiuyang/onos,LorenzReinhart/ONOSnew,kuangrewawa/onos,Shashikanth-Huawei/bmp,osinstom/onos,Shashikanth-Huawei/bmp,sonu283304/onos,mengmoya/onos,kkkane/ONOS,gkatsikas/onos,osinstom/onos,CNlukai/onos-gerrit-test,gkatsikas/onos,mengmoya/onos,sdnwiselab/onos,y-higuchi/onos,zsh2938/onos,castroflavio/onos,lsinfo3/onos,CNlukai/onos-gerrit-test,Shashikanth-Huawei/bmp,chinghanyu/onos,oplinkoms/onos,y-higuchi/onos,CNlukai/onos-gerrit-test,oeeagle/onos,mengmoya/onos,oeeagle/onos,planoAccess/clonedONOS,SmartInfrastructures/dreamer,kuujo/onos,kkkane/ONOS,oplinkoms/onos,castroflavio/onos,osinstom/onos,donNewtonAlpha/onos