[Merge] lp:~jonas-drange/ubuntu-ui-extras/dedupe-requests into lp:~phablet-team/ubuntu-ui-extras/printer-components

[Andrew Hayzen]

Review: Approve

LGTM, prevents multiple threads loading the same printer :-)
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https://code.launchpad.net/~jonas-drange/ubuntu-ui-extras/dedupe-requests/+merge/318218
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