Make locking pluggable

Registered by Jim Rollenhagen

Locking in the DB is pretty bad. It gives the possibility to do things like
end up with stuck locks, for example if a conductor crashes. There exist
systems built with locking primitives, that support TTLs and other
features to make locking more manageable. Let's give people the ability
to use them.

Blueprint information

Status:
Not started
Approver:
None
Priority:
Undefined
Drafter:
Jim Rollenhagen
Direction:
Needs approval
Assignee:
None
Definition:
New
Series goal:
None
Implementation:
Unknown
Milestone target:
None

Related branches

Sprints

Whiteboard

Gerrit topic: https://review.openstack.org/#q,topic:pluggable-locking,n,z

Addressed by: https://review.openstack.org/180342
    Pluggable locking

Gerrit topic: https://review.openstack.org/#q,topic:bp/pluggable-locking,n,z

Addressed by: https://review.openstack.org/179962
    Make node locking pluggable

Addressed by: https://review.openstack.org/179965
    WIP: Add etcd task manager

We're moving from using blueprints to track features to RFE bugs. I've filed one for your change (see related bugs section). Please track further work there using Closes-Bug, Partial-Bug or Related-Bug in commit messages and use this newly created RFE bug.
//vdrok 2015-12-16

(?)

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