Add grains for the cloud metadata server
Add grains for the cloud metadata server

My understanding is that this should always appear at 169.254.169.254.

This is specifically used with ec2 and openstack, and possible some
other cloud providers, but this format should work for the two I know
of.

Closes #37436

saltstack/salt,saltstack/salt,saltstack/salt,saltstack/salt,saltstack/salt