webadminInstall: RHEL/CentOS updates

Added commands to edit php.ini on RHEL-based systems, as the php.ini
file copied in has no effect.
Prevented the rc.local file from being stomped by the install process,
added update
Added additional parameters to the httpd ssl.conf to improve
troubleshooting logs.
Removed update of functions.php, as this is now had led within php.