Add hardware and driver option snippets (device, driverdisk, fcoe, iscsi, iscsiname, mediacheck, unsupported_hardware, zfcp)

[sfloess]

Part of #15: Include all option snippets as found in the kickstart guide.

Scope

Add option snippets for hardware and driver-related kickstart commands:

• device - Install extra device drivers (mostly for PCI devices not auto-detected)
• driverdisk - Load a driver update disk during installation (driverdisk [partition | --source= | --biospart=])
• fcoe - Specify FCoE devices to be activated during installation (fcoe --nic= --dcb --autovlan)
• iscsi - Attach additional iSCSI storage (iscsi --ipaddr= --target= [--port= --user= --password=])
• iscsiname - Assign a name to an iSCSI node (iscsiname iqn)
• mediacheck - Verify installation media integrity before installing (mediacheck)
• unsupported_hardware - Suppress unsupported hardware warnings during installation
• zfcp - Define a Fibre Channel device (System z only) (zfcp --devnum= --wwpn= --fcplun=)

Reference

RHEL 7 Kickstart Syntax Reference - Section 27.3

Acceptance Criteria

• Each command has a corresponding snippet file under snippets/options/
• Snippets follow the existing pattern/style used by other option snippets in the repo
• Key options for each command are parameterized via cobbler variables