[Merge] lp:~sylvain-pineau/ubuntu/trusty/plainbox-provider-checkbox/namespace_fix into lp:ubuntu/plainbox-provider-checkbox

[Zygmunt Krynicki]

FYI: this got merged and uploaded into Ubuntu but this is not reflected here
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https://code.launchpad.net/~sylvain-pineau/ubuntu/trusty/plainbox-provider-checkbox/namespace_fix/+merge/212629
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