The legacy install-guide directory is removed, projects
host thei install-guide under /doc/source/install/.
It should have been done in:
Ifdeb7c669e7f2351aff837f43f2fa3515a89e086
Change-Id: Ia65804cd01ada25f6b61c1c4bcb246d5a4c9c570
Add documentation to create a basic Docker Swarm cluster and create
a container.
Change-Id: I43c7701fbd55153e0e36a915efed802dd1fe5ea4
Partially-Implements: blueprint magnum-installation-guide