[Merge] ~nteodosio/software-properties:xenial-ua into software-properties:ubuntu/xenial

[Nathan Teodosio]

The proposal to merge ~nteodosio/software-properties:xenial-ua into software-properties:ubuntu/xenial has been updated.

Description changed to:

This is a backport of the Ubuntu Pro tab to Xenial's software-properties.

For more details, see:
https://code.launchpad.net/~nteodosio/software-properties/+git/software-properties/+merge/448388
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