Updated Compute installation and added instance-boot procedure

nova-controller:Turned steps into procedure. Added note to make
 api_paste.ini visible. Fixed endpoint-create parameters.
nova-compute: Turned steps into procedure. Fixed typo. Added note
 to make api_paste.ini visible.
nova-boot: New page/procedure for launching an instance.

Change-Id: I081e163243cbb3b2a00b30f4fece1ab09f0df9ad