[install] Add cli install in IT
[install] Add cli install in IT

* Add cli install instructions in the install-guide-from-source
* Link the launch an instance and verify operation sections

Change-Id: I82b029ff85f56ee34e037e9287753d3212fd2982
Partially-Implements: blueprint magnum-installation-guide

ArchiFleKs/magnum,ArchiFleKs/magnum,openstack/magnum,openstack/magnum