##### SUMMARY
This feature would implement a SetManagerNic command for the Manager category of redfish_config, to update Manager NIC configuration. 

##### ISSUE TYPE
- Feature Idea

##### COMPONENT NAME
redfish_config

##### ADDITIONAL INFORMATION
This command would help user to configure their Manager NIC.
return {'ret': False,
                        'msg': "Boot device %s not in list of allowable values (%s)" %
                               (bootdevice, allowable_values)}
        
        enabled = boot.get('BootSourceOverrideEnabled')
        target = boot.get('BootSourceOverrideTarget')
        cur_uefi_target = boot.get('UefiTargetBootSourceOverride')
        cur_boot_next = boot.get('BootNext')
        if bootdevice == 'UefiTarget':
            if not uefi_target:
                return {'ret': False,
                        'msg': "uefi_target option required to SetOneTimeBoot for UefiTarget"}
            if enabled == 'Once' and target == bootdevice and uefi_target == cur_uefi_target:
                
                return {'ret': True, 'changed': False}
            payload = {
                'Boot': {
                    'BootSourceOverrideEnabled': 'Once',
                    'BootSourceOverrideTarget': bootdevice,
                    'UefiTargetBootSourceOverride': uefi_target
                }
            }
        elif bootdevice == 'UefiBootNext':
            if not boot_next:
                return {'ret': False,
                        'msg': "boot_next option required to SetOneTimeBoot for UefiBootNext"}
            if enabled == 'Once' and target == bootdevice and boot_next == cur_boot_next:
                
                return {'ret': True, 'changed': False}
            payload = {