istio-iptables: remove confusing todo (#31492)
istio-iptables: remove confusing todo (#31492)

Currently all environment variables that match the flags added in the `init()`
of `root` will be loaded into Viper as default, and further be used in the
execution.

The TODO is somewhat confusing as there is no actual `obsolete environment
variable` and the pointed `ISTIO_SERVICE_CIDR` should still be used in VM cases.

Signed-off-by: Kailun Qin <0149305a169f8e13c8ed09a5bc4eb461ee5c4925@intel.com>
istio/istio,istio/istio,istio/istio,istio/istio,istio/istio