Finished with Controller Node Concepts

GUI Label ID's ... warning for other commiters, make sure that the
images have different ID's if you are copy pasting the docs for
refactoring.

Need to get some text for Glance Conceptual Section, should be able
to finish with Controller Node Installation and Network Node
Concepts by the end of the day.

b/p training-manuals

Change-Id: I2d2f43d74c39e9ffeb9d7a56b83dcef182a284be
Merge "Finished with Controller Node Concepts"