[Update BMC]
Update image steps from curl:

step1:
Open a new Redfish token:
ex:
$ export bmc=xx.xx.xx.xx
$ export token=`curl -k -H "Content-Type: application/json" -X POST https://${bmc}/login -d '{"username" :  "root", "password" :  "0penBmc"}' | grep token | awk '{print $2;}' | tr -d '"'`

step2:
Redfish UpdateService to flash the BMC firmware:
$ curl -k -H "X-Auth-Token: $token" -H "Content-Type: application/octet-stream" -X POST -T <image tar file path> https://${bmc}/redfish/v1/UpdateService

step3:
Reboot BMC to start the firmware update
