salt: use tojson when splicing in complex structures

[NicolasT]

Sometimes we use a complex structure as an interpolated value in an SLS
file. Whilst this works, this is merely by accident, and Salt 2019.2
changes the behaviour: complex values would be spliced in using their
unicode representation, including u"" markers.

As such, use a proper tojson filter in the Jinja templates instead.

See: #650
See: #650
See: https://docs.saltstack.com/en/latest/topics/releases/2019.2.0.html#non-backward-compatible-change-to-yaml-renderer

[bert-e]

Hello nicolast,

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[bert-e]

Integration data created

I have created the integration data for the additional destination branches.

• this pull request will merge bugfix/use-tojson into
  development/2.4
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[bert-e]

Waiting for approval

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Peer approvals must include at least 1 approval from the following list:

• @tcarmet

• @jbertran

• @carlito-scality

• @slaperche-scality

• @NicolasT

• @TeddyAndrieux

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[TeddyAndrieux]

LGTM

[NicolasT]

/approve

[bert-e]

Build failed

The build for commit did not succeed in branch bugfix/use-tojson.

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[bert-e]

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[bert-e]

I have successfully merged the changeset of this pull request
into targetted development branches:

• ✔️ development/2.4

• ✔️ development/2.5

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• development/1.0
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• development/2.3

Please check the status of the associated issue None.

Goodbye nicolast.