[19.03 backport] allocateNetwork: fix network sandbox not cleaned up on failure #41081
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partial backport (only the first commit) of #41020
The defer function was checking for the local
err
variable, not on the error that was returned by the function. As a result, the sandbox would never be cleaned up for containers that used "none" networking, and a failiure occured during setup.- Description for the changelog
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