Add absolute limits extension for cinder

Also, clean up code samples (extra copies)
Update pointers to code samples
Add parameter descriptions to common.ent for limits extension

Closes-Bug: #1240789

Change-Id: I8e2f4cc15392a0c560bddda9a20a8b0aa3e67c3b
author: diane fleming
Merge "Add absolute limits extension for cinder"