When using a Proxy configuration with "()" characters in the password during an installation. The control plane nodes can't fill their resolv configuration since the script resolv-prepender.sh is failling due to those characters present in the password Proxy configuration.

4.14 / 4.15    

Launch an installation with those characters in a Proxy configuration :

export HTTP_PROXY=http://ZSJP_OPENSHIFT:XXXXXXX@SRV:port
export HTTPS_PROXY=http://ZSJP_OPENSHIFT:XXXXXXX@SRV:port

1. Launch an installation with a Proxy configuration
2. Change Proxy password with "()" characters
3. Check the control-plane nodes status 
4. Check this service status : 
      systemctl status on-prem-resolv-prepender.service      

Apr 11 09:29:38 test-79fw2-master-0 systemd[1]: Starting Populates resolv.conf according to on-prem IPI needs...
Apr 11 09:29:38 test-79fw2-master-0 resolv-prepender.sh[2020]: /usr/local/bin/resolv-prepender.sh: line 4: syntax error near unexpected token `('
Apr 11 09:29:38 test-79fw2-master-0 systemd[1]: on-prem-resolv-prepender.service: Main process exited, code=exited, status=2/INVALIDARGUMENT
Apr 11 09:29:38 test-79fw2-master-0 systemd[1]: on-prem-resolv-prepender.service: Failed with result 'exit-code'.
Apr 11 09:29:38 test-79fw2-master-0 systemd[1]: Failed to start Populates resolv.conf according to on-prem IPI needs.

The resolv configuration gets populated properly and the installation of control-planes keep on going.