[Rbac] Rename include_for_find to references
[Rbac] Rename include_for_find to references

The only caller for `#include_references` was changed to use a new
`:references` param in fbe1d2010c070c386e7cbb90428d8fac41ef5ad8:

  https://github.com/ManageIQ/manageiq/commit/fbe1d2010c070c386e7cbb90428d8fac41ef5ad8

But didn't change the method arg to be called `references` as well,
which is confusing (personally).

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