msgs.picmg: Allow additional response data in FruControlRsp
msgs.picmg: Allow additional response data in FruControlRsp

FRU Control messages such as FRU Control Diagnostic Interrupt may have a
response with additional data.

Signed-off-by: Paul Barker <efd9e9316dd5da2fe913c00dbba8ff5e03adeece@commagility.com>

kontron/python-ipmi