Code review comment for lp:~andreserl/maas/maas_ipmi_lan2.0

Instead of a boolean, we could have a drop down choice with all the available driver types:
Excerpt from man ipmipower:
       -D IPMIDRIVER, --driver-type=IPMIDRIVER
              Specify the driver type to use instead of doing an auto selection. The currently available outofband drivers are LAN and LAN_2_0, which perform IPMI 1.5 and IPMI 2.0 respectively.