Strange behaviour: mirror/suite resetted to "testing" at some moment in the install

[Christian Perrier <bubulle@debian.org>]

This test was done using the sid_d-i businesscard image.

I boot the installer with "linux DEBCONF_PRIORITY=medium mirror/suite=unstable"

Before and after choosing the language, keyboard...the mirror/suite is
still filled with "unstable".

Howver, after the "Detect and mount CD-ROM" step (and before "Lost
installer components from CD"), this value is resetted to "testing".

I currently have no idea of the right place to report this...and I
really don't understand why this value suddenly changes at this moment.

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