[Openocd-development] [COMMIT] JTAG error handling and command handling fixes

[Spen <sp...@sp...>]

> 
> - fix broken JTAG error handling
> - Allow all commands to be executed during config stage
> - Help now works for config commands
> - make var args handling follow the rules more closely
> 
> --

committed.

Cheers
Spen