Provide `env` to templates.

Map `env` to the same value of `saltenv` in the templating context until
`env` is fully deprecated in favor of `saltenv`.

Fixes #11480.
Merge pull request #11640 from s0undt3ch/hotfix/env-in-jinja-context

Provide `env` to templates.
Remove extra white-space
Initial addition of a module to manage IP sets.