This commit uses the MLST command (where available) to get the status
for single files rather than listing the parent directory and looking
for the file. This makes actions such as using `--files-from` much quicker.
* use getEntry to lookup remote files when supported
* findItem now expects the full path directly
It makes the expected argument similar to the getInfo method, the
difference now is that one is returning a FileInfo whereas
the other is returning an ftp Entry.
Fixes#6225
Co-authored-by: Nick Craig-Wood <nick@craig-wood.com>
1628ca0d46