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

[Gustavo Pichorim Boiko]

Gustavo Pichorim Boiko has proposed merging lp:~phablet-team/history-service/single_instance_using_lock_file into lp:history-service/staging with lp:~phablet-team/history-service/optimize_dbus_traffic as a prerequisite.

Commit message:
Use a QLockFile to ensure there will be only one instance of the daemon per user.
As we now delay the registration on dbus, sometimes we ended up having two
instances of the daemon running (because of dbus activation). This change makes
sure that won't happen.

Requested reviews:
  Ubuntu Phablet Team (phablet-team)

For more details, see:
https://code.launchpad.net/~phablet-team/history-service/single_instance_using_lock_file/+merge/318949

Use a QLockFile to ensure there will be only one instance of the daemon per user.
As we now delay the registration on dbus, sometimes we ended up having two
instances of the daemon running (because of dbus activation). This change makes
sure that won't happen.
-- 
Your team Ubuntu Phablet Team is requested to review the proposed merge of lp:~phablet-team/history-service/single_instance_using_lock_file into lp:history-service/staging.
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