[Merge] ~nteodosio/software-properties:ua-attach-tests into software-properties:ubuntu/master

[Nathan Teodosio]

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

Description changed to:

Adds tests for Ubuntu Pro attachment in Software Properties.

PPA build: https://launchpad.net/~nteodosio/+archive/ubuntu/rebuilds/+build/25647866

For more details, see:
https://code.launchpad.net/~nteodosio/software-properties/+git/software-properties/+merge/438462
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