susInstall: RHEL/CentOS updates

Cleaned up directory creation.
Added httpd include for SUS, rather than editing the default httpd.conf
file.
NetSUSInstaller: Minor cleanup

Tidied up directory creation.
Updated RHEL/CentOS code for removing the MAC address from the NIC.
configurefornetboot: imageid

Updated to make this aware of the NetBoot Image ID, this will be used
later when an update is applied to have the NetSUS detect the image ID
& Name, and broadcast this instead of Faux NetBoot.