The *downside* of reverting our custom patch is that end-users are used
to all their personal customization of applications from $HOME working;
i.e. currently, when anyone runs vim, emacs, bash, etc. under sudo, any
~/.WHATEVER customization they have will be retained.  This is different
than, essentially, all other UNIXes, and the fix for this bug would undo
that, to put us back in line with all other UNIXes - but would result in
behavior change for users, where e.g. 'sudo vim' would not pick up any
of their ~/.vimrc configuration (or ~/.emacs.d for emacs, etc...)

Thus, this change, if we do make it, probably should only be done to
Eoan and not SRUed.

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https://bugs.launchpad.net/bugs/1556302

Title:
  Ubuntu patch to add HOME to env_keep makes custom commands vulnerable
  by default

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