Do not ask to initialize disks with softraid chunks

Do not ask to initialize disks with softraid chunks

Skip chunk devices in the 'Which disk do you wish to initialize?' question.
Touching sd0, e.g. after a root on softraid sd1 install on sd0, will fail.

get_dkdevs_uninitialized() is used once, in interactive installs, right
after root disk setup, iff multiple disks exist.

Tested as part of a bigger diff by a few
OK cheloha