thrift: add cassandra.thrift
thrift: add cassandra.thrift

Taken from cassandra.git bf599fb5b062cbcc652da78b7d699e7a01b949ad.

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