Bug#925893: Also ask "Do not configure the network at this time" *before* trying to configure the network

[積丹尼 Dan Jacobson <jidanni@jidanni.org>]

Package: debian-installer
Severity: minor

Please also ask "Do not configure the network at this time" *before* trying
to configure the network. Not only after, and failing.

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That way users installing offline wouldn't need to answer several futile
questions and have futile DHCP packets sent to them.

And then no point in asking them apt-setup_no_mirror questions:

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