Set unique BMC hostname using inventory or mac

To prevent hostnames conflicts across systems, this change generates a
unique hostname by appending either the system serial number (from
inventory) or

Set unique BMC hostname using inventory or mac

To prevent hostnames conflicts across systems, this change generates a
unique hostname by appending either the system serial number (from
inventory) or mac address to the default hostname.

This operation is executed only at the first boot or after a factory
reset, ensuring that user-configured hostnames are not overwritten

Tested By:
* Verified unique hostname generation on first boot
* Verified hostname persistence across reboots.

Change-Id: I719eb0bee55913726471656b4ed284a3441b97c6
Signed-off-by: Asmitha Karunanithi <asmitk01@in.ibm.com>

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