Split out from #2133.

At the moment you cannot run ARM images what doesn't include variant information, because we check that variant matches with the current environment.

Based on this http://single-boards.com/armv6-vs-armv7/, it's safe to assume that ARMv7 is backward compatible to ARMv6:

ARMv7 is backward compatible with ARMv6, so binaries compiled for ARMv6 should also work on ARMv7

So I'm suggesting that in case of the image doesn't include variant information:

• If current environment is ARMv7, run container because it supports v6 and v7
• If current environment is ARMv6, fail because we cannot be sure does it work

Here's one example image without variant information for testing purpose docker.io/arm32v7/busybox:latest

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