Restart task's that uses secrets that rendered throw consultemplate when nomad client restarts

[tantra35]

This pull request was created as replacement for #6059

This PR try solve problem which described in #4226

This is a second our try to push this in nomad mainline, first was declined due huge code changes between 0.8.x and 0.9.x

The key idea of this patch is, in fact that consul-template doesn't persisted it state between nomad agent restarts(for example systemctl restart nomad) and regenerate dynamic secrets(for example https://www.vaultproject.io/docs/secrets/aws/index.html) but in case of restart nomad doesn't inform about this fact tasks(this happens only when agent restarts), and there can be situations when secrets already revoked by vault, but task still running

Some remarks from @nickethier (from #6059) we will fix, after some times

Sorry for our mistake in git branches management :-(

[tgross]

Closing this PR in lieu of the approach described in #9491 (comment). Sorry this sat around so long unreviewed... we knew it wasn't quite how we wanted to do it but we didn't manage to get resources on the issue to resolve it. I'm working that one now.

[github-actions]

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