gossip: Add default constructor for endpoint_state
gossip: Add default constructor for endpoint_state

rluta/scylla,rluta/scylla,capturePointer/scylla,victorbriz/scylla,stamhe/scylla,dwdm/scylla,asias/scylla,scylladb/scylla,glommer/scylla,shaunstanislaus/scylla,rentongzhang/scylla,bowlofstew/scylla,tempbottle/scylla,wildinto/scylla,rentongzhang/scylla,phonkee/scylla,victorbriz/scylla,gwicke/scylla,dwdm/scylla,gwicke/scylla,gwicke/scylla,guiquanz/scylla,rluta/scylla,avikivity/scylla,justintung/scylla,duarten/scylla,linearregression/scylla,acbellini/scylla,raphaelsc/scylla,eklitzke/scylla,asias/scylla,avikivity/scylla,eklitzke/scylla,senseb/scylla,phonkee/scylla,bowlofstew/scylla,respu/scylla,capturePointer/scylla,bowlofstew/scylla,kangkot/scylla,dwdm/scylla,kangkot/scylla,victorbriz/scylla,aruanruan/scylla,justintung/scylla,avikivity/scylla,phonkee/scylla,glommer/scylla,capturePointer/scylla,kjniemi/scylla,scylladb/scylla,guiquanz/scylla,asias/scylla,aruanruan/scylla,rentongzhang/scylla,raphaelsc/scylla,respu/scylla,glommer/scylla,eklitzke/scylla,kangkot/scylla,duarten/scylla,senseb/scylla,tempbottle/scylla,kjniemi/scylla,duarten/scylla,wildinto/scylla,senseb/scylla,linearregression/scylla,aruanruan/scylla,raphaelsc/scylla,stamhe/scylla,linearregression/scylla,tempbottle/scylla,stamhe/scylla,acbellini/scylla,guiquanz/scylla,wildinto/scylla,shaunstanislaus/scylla,scylladb/scylla,respu/scylla,justintung/scylla,shaunstanislaus/scylla,acbellini/scylla,scylladb/scylla,kjniemi/scylla