More cleanup/simplification/shrinkage.

1) Factor out inquiring for a device. ask_fordev()
   now does this for root disk determination, other
   disk initialization, install sets disk or cd
   inquiry. Also ensures cd devices are created on
   the fly like disk devices already were, and
   shortens some verbiage.

2) Just ask for root disk if install is skipping
   disk initialization, rather than doing the
   'df /mnt ...' scan, since 1) we just end up asking
   anyway and 2) everything *should* have been
   umount'ed when previous install was finished or
   interrupted.

3) getrootdisk -> get_rootdisk to conform to
   get_<global> naming convention.

4) Add and use new global ROOTDEV rather than
   constantly adding 'a' to ROOTDISK. ROOTDEV
   default is set in get_rootdisk().

5) Put loop inside get_rootdisk rather than
   always putting one around it. If no rootdisk
   found/specified just exit install/update.

6) Eliminate getanotherdisk since ask_fordev()
   does most of the work.

7) Eliminate parameter to check_fs, just use
   ROOTDEV instead.

8) Some typographical and minor code tweaks.

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