delorean-repo:
replaced by tripleo-repos and other repo setup approaches
hosts:
heat hasn't manage hosts file for many releases
localboot:
replaced by diskimage-builder grub2, bootloader elements
ntp:
replaced by installing chrony package
os-net-config:
the package is installed by other elements, and the script is now
called from ansible
overcloud-dracut:
replaced by diskimage-builder dracut-regenerate element
overcloud-partition:
no image now uses this, overcloud-hardened-uefi-full uses
overcloud-partition-uefi
Change-Id: I990493b51d87a40140c1648f2b04c982ce959b1d
When used with partition image, adds capability to be able to
boot from local storage upon first PXE boot so that if subsequent
PXE boot fails, instances can still boot from local storage.
Change-Id: I4f412b604c1b21ef14c7e578851887fe7b7d0f7d