Nomad needs to sanitize the injected env var names

[timperrett]

lets say i have a job callled foo-bar. Nomad will at runtime inject an env var, NOMAD_ADDR_foo-bar_whatever. Given that dashes are not allowed in env vars names, they must be sanitized by nomad for the bash-allowed var syntax.

[schmichael]

Attached a binary built from #2406 if you want to test it. NBD

linux_amd64.zip

[schmichael]

Missed an env var with that first pass. Got 'em all now.

linux_amd64.zip

[github-actions]

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