Éric Lemoine d87786e41e Change Jinja2 expressions in heka.json.j2
This follows up on a review comment from sdake [*] and change the
Jinja2 expressions used in heka.json.j2.

[*] <https://review.openstack.org/#/c/283118/3/ansible/roles/common/templates/heka.json.j2@49>

TrivialFix

Change-Id: I20ee5084cfef6acf53a737757fe727df5b4e9fce
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