Adds updated install guide content

Adds install guides content to basic-install-guides folder. This content will
soon be modified, edited and pushed back to install gudies. It will be linked
from inside install guide and the copy in training guides will be deleted.

This patch adds these files for easy transition and also to figure out
different changes to install guides without having to compromise on quality and
also to meet Juno2 release date.

Change-Id: I8ad0860eae53304cf08448aa67f12b6e3ea9caae
Implements: blueprint openstack-training-guides
Merge "Adds updated install guide content"