[Rule-list] Bug in Slinky 0.2.6 setup.sh

[John W. Himpel]

If one is installing from a CDROM, the environment variable "image_part"
is never set.

This causes the following command to get a syntax error which in turn
prevents setup.sh from proceeding much further.

fdisk -l | grep Linux | grep -v swap |\
    grep -v $image_part | cut ..... | cut .....

It either needs to have a "dummy" value set for $image_part or an if
statement to not perform the grep for a cdrom install.

Thanks.