thrift: stub execute_cql3_query()
thrift: stub execute_cql3_query()

Allows us to proceed further with cassandra-stress.

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