ftp: pass a network deadline to the ftp package
ftp: pass a network deadline to the ftp package

This should avoid having one or more scanning goroutine stuck forever
waiting for an FTP server response.

kib/mirrorbits,kib/mirrorbits,Myself5/mirrorbits,etix/mirrorbits,kib/mirrorbits,etix/mirrorbits,Myself5/mirrorbits,Myself5/mirrorbits,etix/mirrorbits