CLDSRV-873: return checksum in HeadObject and GetObject#6117

leif-scality wants to merge 1 commit intodevelopment/9.4scality/cloudserver:development/9.4from

improvement/CLDSRV-873-head-get-object-return-checksumscality/cloudserver:improvement/CLDSRV-873-head-get-object-return-checksumCopy head branch name to clipboard