Using local BMC fails to get sensor data

[Bryan Seitz]

Pyghmi version: 1.3.0
Python version: 2.7.15

Calling get_sensor_data and iterating over the response on a bmc=None command session yields:

---
sensor_data = ipmi.get_sensor_data()
for x in sensor_data:
    print x
---

pyghmi/pyghmi-cpython-27/pyghmi/ipmi/command.py", line 446, in xraw_command
    rsp['data'] = buffer(rsp['data'])
TypeError: buffer object expected

The rsp['data'] object is a list when using the local bmc interface instead of OOB.

If you cast this to bytearray before calling buffer, it works as expected.
rsp['data'] = buffer(bytearray(rsp['data']))

Also seems to work on OOB session as well, but not sure how you'd want to fix this and other differences that might exist as well.