Try IPMI simulator (virtual BMC) again

[Gerrit91]

This would give us much higher test coverage as also the ipmi_sim from OpenIPMI seems to be pretty much feature complete.

First steps for trying it out would be:

• Use QEMU flags like

   -device ipmi-bmc-sim,id=bmc0
   -chardev socket,id=ipmi0,host=localhost,port=9002,reconnect=10 
   -device ipmi-bmc-extern,id=bmc1,chardev=ipmi0 
   -device isa-ipmi-kcs,bmc=bmc1
  

• Connect ipmi_sim to this device
• Try commands with ipmitool

If this works out, we can think about where we can deploy the metal-bmc to connect the system to the metal-stack. With this, we could start integration tests for go-hal and also refactor go-hal that we have a working default implementation for the IPMI protocol (wider hardware support).

References:

• Refactoring ideas go-hal#49
• Tests go-hal#51

Additional information:

• http://www.linux-kvm.org/images/7/76/03x08-Juniper-Corey_Minyard-UsingIPMIinQEMU.ods.pdf