Revert "engine: fix engine.Env.Encode() to stop auto-guessing types."

This reverts commit 76057addb255e6f14dd03c276317abc759a15a80.

Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@crosbymichael.com> (github: crosbymichael)
Use setjson hack again for version
Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@crosbymichael.com> (github: crosbymichael)
Revert "remove hack in version"

This reverts commit b2b9334f27e1a773b77241efa214af2e87439d3b.

Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@crosbymichael.com> (github: crosbymichael)
Merge pull request #5031 from crosbymichael/revert-env

Revert env changes