This reverts commit cdfc94f4e9, reversing
changes made to 2051cd3e1c.
Conflicts:
initialize/config.go
system/etcd.go
system/etcd_test.go
system/fleet.go
system/fleet_test.go
system/update.go
system/update_test.go
test
This uses the new MetadataService implementation to retrieve values for
$private_ipv4 and $public_ipv4 substitutions, instead of using
environment variables.
