How to connect multiple backend k8s services across namespaces from Apigee to achieve Multitenancy

[samirj]

We have a GKE cluster with multiple namesspaces for different Customers. Each namespace has Kubernetes service named "myService". 

We want to connect to these k8s services from Apigee proxies. When request comes from customer A  then "myService" from Namespace for Customer A should be called from Apigee proxy.

Similarly ,  When request comes from customer B then "myService" from Namespace for Customer B should be called from Apigee proxy.

What can be the optimal solution to make these 1-to-1 connections possible from Apigee proxy to corrospnding k8s service on respective Namespace.

@imesh @strebel @anilsr