cell_name: always include default comparator for version 2.1.8 and lower
cell_name: always include default comparator for version 2.1.8 and lower

This is the biggest change from 2.2: for the 2.1 series, the default type is
always stored in the comparator for compound types.

Signed-off-by: Glauber Costa <f8b79557d19b40666ebe336545a0b6178af65685@cloudius-systems.com>

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