Ingress with both http and https enabled yields two separate IPs

[skmatti]

The following sequence of configuration changes to an ingress leads to split IPs with ingress v1.8 (with enable-delete-unused-frontends set)

1. Create an Ingress with both http and https enabled. (Static IP is used)
2. Disable http (Static IP is retained and used by https forwarding rule)
3. Re-enable http (New ephemeral IP is created for http forwarding rule, but https forwarding rule uses static IP)

Ingress versions older than v1.8 do not run this issue because http forwarding rule is not deleted when disabled. But, manual deletion of http forwarding rule results in separate IPs.

[skmatti]

/assign @skmatti