tweaks to tripleo-concept.odp

- add razor
- mention vendor-specific tools
Minor cleanup of boot-elements

- correct (c) date
- correct --help header line
- make --help always work, even if things aren't in PATH
Add load-image script

The load-image script takes a qcow2 image file (eg, demo.qcow2)
and loads it into Glance. It reads the OS end point and credientials
from the ENV vars or from ~/stackrc.

Updates to notes.md will follow in a separate patch.
Image size now set by DIB_IMAGE_SIZE

Fix scripts/boot-elements to match change id
bd1bae7c580fad65c6d73a6c104ccb8dd96ee04e in disk-image-builder