Description of problem:

Dedicated Admins need the ability to join project networks. 

  https://docs.openshift.com/dedicated/admin_guide/pod_network.html#joining-project-networks


The user gets the following error: 

Error from server: User "X" cannot list all netnamespaces in the cluster


How reproducible:
100%

Steps to Reproduce:
1. $ oadm pod-network join-projects --to=<project1> <project2> <project3>


Actual results:
Error 

Expected results:
Able to join networks

Additional info:

To fix this, dedicated-admin need to be able to view all namespaces. 

   Add auth to dedicated-admin similar to that what cluster-viewer gives.