Operators Note: In newer versions of ubuntu the MD4 hashing algorithm
is disabled by default. To enable it the openssl config needs to be
updated in a manner similar to what's being done here. Alternatively,
you can set the `FEATURES['ENABLE_BLAKE2B_HASHING']` setting to `True`
which will switch to a newer hashing algorithm where MD4 was previously
used.
Because this hashing is being used as a part of the edx-platform caching
mechanism, this will effectively clear the cache for the items that use
this hash. The will impact any items where the cache key might have been
too big to store in memcache so it's hard to predict exactly which items
will be impacted.
BREAKING CHANGE: See the operator note above for more details as this
may break for users transitioning from Ubuntu 20.04 to newer versions.
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