CLDSRV-849: don't crash if invalid Date header#6079

bert-e merged 3 commits intodevelopment/9.2scality/cloudserver:development/9.2from

bugfix/CLDSRV-849-dont-crash-if-invalid-Date-headerscality/cloudserver:bugfix/CLDSRV-849-dont-crash-if-invalid-Date-headerCopy head branch name to clipboard