salt: Do not interpolate when parsing sysctl config files

[gdemonet]

Fixes: #3223

[gdemonet]

/approve

[bert-e]

Waiting for approval

The following approvals are needed before I can proceed with the merge:

• the author

• one peer

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

• @thomasdanan

• @alexandre-allard-scality

• @JBWatenbergScality

• @gdemonet

• @lucieleonard

• @ChengYanJin

• @TeddyAndrieux

• @NicolasT

The following options are set: approve

[bert-e]

Build failed

The build for commit did not succeed in branch w/2.9/bugfix/3223-no-interpolation-in-sysctl-conf.

The following options are set: approve

[bert-e]

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• ✔️ development/2.9

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The following options are set: approve

[bert-e]

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

• ✔️ development/2.8

• ✔️ development/2.9

The following branches have NOT changed:

• development/1.0
• development/1.1
• development/1.2
• development/1.3
• development/2.0
• development/2.1
• development/2.2
• development/2.3
• development/2.4
• development/2.5
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• development/2.7

Please check the status of the associated issue None.

Goodbye gdemonet.