uftp filesystem support

[sverhoeven]

Some HPC clusters now promote using uftp to transfer files. Would be nice to support this protocol.

See https://www.hpcwire.com/off-the-wire/gcs-centres-sc-asia-data-mover-challenge/

There is a Java client at https://github.com/UNICORE-EU/uftp/tree/master/uftp-client

[jmaassen]

Interesting, I'll have a look.