CLOUDSTACK-7009: add ability to handle serviceofferingdetails to base.py
to support creation of service offering upon passing details in the  following format
            serviceofferingdetails[1].key=pciDevice
            serviceofferingdetails[1].value=Group of NVIDIA Corporation GK107GL [GRID K1] GPUs
            serviceofferingdetails[2].key=vgpuType
            serviceofferingdetails[2].value=GRID K120Q