Description of deploy configuration options

Configuration option = Default value	Description
[deploy]
dd_block_size = 1M	(StrOpt) Block size to use when writing to the nodes disk.
efi_system_partition_size = 200	(IntOpt) Size of EFI system partition in MiB when configuring UEFI systems for local boot.
iscsi_verify_attempts = 3	(IntOpt) Maximum attempts to verify an iSCSI connection is active, sleeping 1 second between attempts.