Enable OpenShift IPI Installer to deploy OCP to a shared VPC in GCP

Proposed title of this feature request

• Support deploying OCP in “GCP Service Project” while networks are defined in “GCP Host Project”. 

What is the nature and description of the request?

• Enable OpenShift IPI Installer to deploy OCP in “GCP Service Project” while networks are defined in “GCP Host Project”
• “GCP Service Project” is from where the OpenShift installer is fired. 
• “GCP host project” is the target project where the deployment of the OCP machines are done. 
• Customer using shared VPC and have a distributed network spanning across the projects. 

Why does the customer need this? (List the business requirements here)

• Customer current has to spinup a separate “Bastion Host” on the same “GCP Host Project” everytime to spinup GCP which is a hassle and not so cost effective solution . Customer wants to use just one project to spin up all of their clusters in GCP. 

Is there already an existing RFE upstream or in Red Hat Bugzilla?

• No, I could not find one.

Does the customer have any specific timeline dependencies and which release would they like to target?

• OCP 4.9+

Is the sales team involved in this request and do they have any additional input? No

List any affected packages or components.

• openshift installer

Would the customer be able to assist in testing this functionality if implemented?

• Yes