Thanks peetz, that local.sh file worked for me.
Here's what my file looks like,
~ # cat /etc/rc.local.d/local.sh
#!/bin/sh
# local configuration options
# Note: modify at your own risk! If you do/use anything in this
# script that is not part of a stable API (relying on files to be in
# specific places, specific tools, specific output, etc) there is a
# possibility you will end up with a broken system after patching or
# upgrading. Changes are not supported unless under direction of
# VMware support.
# manually set the UUID so N1KV doesn't think the're duplicates
vemcmd card uuid vmware 03000200-0400-0500-0006-000700080099
exit
After the edit above, use the esxi console gui to reload (I think I read somewhere that it will call the backup script to save the file changes).