Make ZeroMQ driver work without eventlet

Registered by Oleksii Zamiatin

Now ZeroMQ driver cannot work without eventlet. There are some places where async calls to methods are made through eventlet.spawn with no alternatives. Provide alternative way of calling methods to use with blocking executor.

Blueprint information

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

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