sandbox: support oci other than runsc

[soulteary]

Allow the program to run in a normal docker environment

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Message from Alex Rakoczy:

Patch Set 1: Hold+1

(1 comment)

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Message from 苏洋:

Patch Set 1:

(1 comment)

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Message from Jenny Rakoczy:

Patch Set 1:

(2 comments)

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Please don’t reply on this GitHub thread. Visit golang.org/cl/414335.
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