hashutil: Add support for md5 sum
Enable to compute md5 sum through the hashutil.MultiHash class.
Nevertheless, md5 is not put in DEFAULT_ALGORITHMS set and must be explicitely requested by client code.
Related to swh/infra/sysadm-environment#2400 (closed) Related to swh-loader-core!247 (closed)
Depends on !205 (closed)
Migrated from D6755 (view on Phabricator)