sanitize provisioner output strings #23302
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ghost
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The grpc protocol requires strings to be valid utf8, but because provisioners often don't have control over the command output, invalid utf8 sequences can make it into the response causing grpc transport errors. Replace all invalid utf sequences with the standard utf replacement character in the provisioner output. The code is a direct copy from the go1.13 std library, and can be replaced with strings.ToValidUTF8 once it's available.
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The grpc protocol requires strings to be valid utf8, but because
provisioners often don't have control over the command output, invalid
utf8 sequences can make it into the response causing grpc transport
errors.
Replace all invalid utf sequences with the standard utf replacement
character in the provisioner output. The code is a direct copy from the
go1.13 std library, and can be replaced with strings.ToValidUTF8 once
it's available.
Replaces #22957
Fixes #23300