Change all magnum commands with the openstack coe equivalents. Change-Id: I812468f9c855329638732f98d76c95c7b8ba64f6
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