Renaming chapter 6 to, "Add the Compute services"

This patch renames chapter 6 to, "Add the Compute services" as a part
of the Install Guide Improvements.

Change-Id: I8cbdad63b4676a2296c871e0d80aa0de1c15781b
Implements: blueprint installation-guide-improvements
Merge "Renaming chapter 6 to, "Add the Compute services""