simpler ftplist[0-9].o.o removal

simpler ftplist[0-9].o.o removal

We read /tmp/i/hosts line-wise to fill /mnt/etc/hosts and remove the tmp
file immediately afterwards, so just skip ftplist entries inside the loop
with a slightly easier to read ksh pattern rather than purge the tmp file
up-front with sed(1).

This is also a tiny bit more robust should the ftplist entries ever be added
with a tab as separator instead of a space and/or an alias since the sed
one-liner hardcodes a single space and expects no alias whereas ksh's read
takes any amount of whitespace between _addr and _hn while not caring about
optional aliases.

Comment is obvious so zap it.

OK millert