Add ability to upload files via FTP

[asfimport]

Scott Cederberg (Bug 42223):
Currently, only FTP download is supported by the FTP Sampler. It would be
useful to have FTP upload as well.

I'm actually part way through the implementation of this. I'm doing the work on
company time, but if I can get my employer's approval and work the bugs out,
I'll submit a patch.

OS: All

[asfimport]

Sebb (migrated from Bugzilla):
Looks like there are problems with the FTP download hanging.

This may be tedious to fix, so I'm thinking that the simplest solution would
be to use an existing library such as the Jakarta Commons Net library. This
includes an FTP client.

Using this should make the addition of FTP upload much simpler too.

[asfimport]

Sebb (migrated from Bugzilla):
Fixed in SVN in r533328