Consistent delimiters for YAQL expressions

Registered by Dmitri Zimine

YAQL delimiters are inconsistent across various cases of using YAQL.
Attempt to fix them with Ansible style "{1+1}" lead to bad readability.
The crux of the problem is trying to use reserved YAML character as expression delimiter.
We should find a safe delimiter and apply it consistently to all expressions in Mistral DSL.

Details here: https://etherpad.openstack.org/p/mistral-YAQL-delimiters

Blueprint information

Status:
Complete
Approver:
None
Priority:
Essential
Drafter:
Dmitri Zimine
Direction:
Approved
Assignee:
Nikolay Makhotkin
Definition:
Approved
Series goal:
Accepted for kilo
Implementation:
Implemented
Milestone target:
milestone icon 2015.1
Started by
Nikolay Makhotkin
Completed by
Renat Akhmerov

Related branches

Sprints

Whiteboard

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

Addressed by: https://review.openstack.org/157741
    Changing YAQL syntax delimeters

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