lsa: Introduce compaction_lock helper
lsa: Introduce compaction_lock helper

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