oemcommands: Implement OEM Get Reading command

Newly implement OEM Get Reading command API. It implements for
"Inlet Air Temperature" Reading type.

Tested:
Verified on single node system using Oem get reading commands.
Command:  ipmitool raw 0x30 0xe2 0x00 0x00 0x00 //OEM Get reading
Response: Unable to send RAW command (channel=0x0 netfn=0x30 lun=0x0
          cmd=0xe2 rsp=0xc9): Parameter out of range
Command:  ipmitool raw 0x30 0xe2 0x10 0x0 0x0 //OEM Get reading
Response: 10 1a 00
Command:  ipmitool raw 0x30 0xe2 0x20 0x0 0x0 //OEM Get reading
Response: Unable to send RAW command (channel=0x0 netfn=0x30 lun=0x0
          cmd=0xe2 rsp=0xc9): Parameter out of range
Command:  ipmitool raw 0x30 0xe2 0x30 0x0 0x0
Response: Unable to send RAW command (channel=0x0 netfn=0x30 lun=0x0
          cmd=0xe2 rsp=0xcc): Invalid data field in request

Signed-off-by: srikanta mondal <srikantax.mondal@intel.com>
Change-Id: I6450fe95b4ef52eed4784561180d1da667d30360
2 files changed