[Merge] lp:~phablet-team/history-service/single_instance_using_lock_file into lp:history-service/staging

[Tiago Salem Herrmann]

Review: Approve

Looks good to me.
good to have this finally resolved.
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https://code.launchpad.net/~phablet-team/history-service/single_instance_using_lock_file/+merge/318949
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