Implement per-user queues and lock when used as system MTA

Registered by Daniel D.

* In order to resolve (https://bugs.launchpad.net/msmtp-scripts/+bug/1812795)
* Locking and queuing need to be per-user even for system users (but should not conflict with use outside being an MTA)
* Dequeuing needs to handle the multiple queues.

Blueprint information

Status:
Complete
Approver:
Daniel D.
Priority:
High
Drafter:
Daniel D.
Direction:
Approved
Assignee:
None
Definition:
Approved
Series goal:
Accepted for 1.2
Implementation:
Implemented
Milestone target:
milestone icon 1.2-b
Started by
Daniel D.
Completed by
Daniel D.

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