usermanager: Add back temporary is_admin to warn about deprecated API usage

Goal: Introduce role-auth with minimal disruption

is_admin() is unsafe in a system with per-session permissions, so it has been
deprecated.

Roll-out approach:

1) First, log a warning when is_admin() is used. It should continue to
   function normally, backed by the new role API. Nothing is really using
   per-session authz yet, so there is minimal security concern.

   The 'strict_deprecate_is_admin' global setting can be set to 'true' to
   force a hard failure of is_admin() attempts (it will log an error and
   always return false).

2) In some time (at least 1 week), but possibly longer depending on the number
   of affected deployments: switch 'strict_deprecate_is_admin' to 'true' by
   default. It can still be disabled for systems that need it.

3) Further in the future, before the next release, the option will be removed
   and is_admin() will be permanently disabled.

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