Description of problem:
I created a cluster with 5 hosts, with 3 master role and 2 worker role, and got validation message:
"Clusters with less than 3 dedicated masters or a single worker are not supported. Please either add hosts, or disable the worker host"

The issue is that the message is a bit confusing, cause i do have the correct number of hosts, it is just that they are not known (due to missing networking settings).

so maybe changing the text a bit, would make it clearer. 


Steps to Reproduce:
1. Create cluster, and disable auto DHCP assign (so hosts wont be known)
2. generate ISO and boot 3 masters and 2 worker nodes
3. look at the cluster validation messages

Actual results:
"Clusters with less than 3 dedicated masters or a single worker are not supported. Please either add hosts, or disable the worker host"

Expected results:
a suggestion: "Clusters with less than 3 masters or a single worker in Status: Known, are not supported."