Refactor to use new version of OEM IPMI Handler

Using the new version of ipmi handler provide a higher level wrapper
over the same functionalities. It helps us parse the input and output to
have mor

Refactor to use new version of OEM IPMI Handler

Using the new version of ipmi handler provide a higher level wrapper
over the same functionalities. It helps us parse the input and output to
have more control of the input/output we see.

Changes to note,
- All cmd are removed from the request data. That is automatically
extracted now.

Tested:
Unit Test Passed.

All IPMI OEM command still works the same as before this change.

```
$ burn_my_bmc -command stage -image /tmp/test.txt -interface ipmipci
Set up ipmi flash updater with /flash/dummy
Received failure on delete: Received IPMI_CC: 255
Sending over the firmware image.
Find [0x1050 0x750]
bar0[0x94000000]
Upload to BMC 100% |Goooooooooooooooooooooooooooooooooooooooooooooooooooooooogle| Time: 00:00:00
Opening the verification file
Committing to /flash/verify to trigger service
Calling stat on /flash/verify session to check status
success
succeeded
```

Also tested gBMC Update workflow which worked fine.

Change-Id: Ib2bfeab0c2ec5aa72ede1ff457ef5f90e488053c
Signed-off-by: Willy Tu <wltu@google.com>

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initial drop of phosphor-ipmi-blobs

This implements a majority of the OEM IPMI BLOBS protocol. The only
piece missing from this is the timed expiration of sessions.

Change-Id:

initial drop of phosphor-ipmi-blobs

This implements a majority of the OEM IPMI BLOBS protocol. The only
piece missing from this is the timed expiration of sessions.

Change-Id: I82c9d17b625c94fc3340edcfabbbf1ffeb5ad7ac
Signed-off-by: Patrick Venture <venture@google.com>

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