Per worker option override

[degremont]

trafficstars

Config options are set "per Task" even if only workers use them. It is not possible to override these defaults per worker instance and this could be useful.

This is, mostly:

• connect/command_timeout
• ssh/scp/rcp/rsh paths
• ssh/scp users
• ssh/scp options

One use case if to have different ssh ports per worker which are not set in global ssh config, intentionally.