Bug#775092: Make sure proxy variable exists before using it

[debian@kvr.at (Christian Kastner)]

Source: autopkgtest
Version: 3.9
Severity: minor
Tags: patch

Hi,

adt-setup-vm uses a $proxy variable which will not exist if no proxy is
locally configured. Because theadt-setup-vm script sets -u, this
generates an error during vmbootstrap:

    Setting up networking
    Running customize script /usr/share/autopkgtest/adt-setup-vm
    /usr/share/autopkgtest/adt-setup-vm: 86: /usr/share/autopkgtest/adt-setup-vm: proxy: parameter not set

Regards,
Christian

PS: This is a re-submission, as the first submission must have been
eaten by the spam filter or something (had a dollar sign in subject).
I refreshed the patch to apply after the fix in #775076.

Regards,
Christian
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