Service network configurable and other improvements

[henkwaanders]

Various issues and improvements for the roll-out.

increase the timeout for 'wait_for_connection' from 30 to 60 minutes. The I ran into cases where the bootstrap node was slow doing his work.

make the service network configurable is key for some implementations as their network is in the 172.30.0.0/16 segment. Need updates in the ocp4-playbooks repo as well.

make the URL of the helpernode and the ocp4-playbooks repositories configurable through the var.tfvars file. This make it more easy to point to your own git-repo for development purposes. Need updates in the ocp4-playbooks repo as well

create a htpasswd file with an admin user on beforehand and configure authentication during install so that the 'kubeadmin' user is not needed anymore. Need updates in ocp4-playbooks as well

enhancement of enabling oc bash completion during install