Added quota consumption to the roles table in the webui.
Added quota consumption to the roles table in the webui.

This keeps the existing 'Allocation + Offered' column, rather than
removing it. However, it would be nice to add additional columns
for reservation, offered resources, and allocation quantities. Then
we can remove the old 'Allocation + Offered' column, but will
probably want to introduce the ability for the user to enable /
disable columns while viewing.

Review: https://reviews.apache.org/r/71043

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