Updated from global requirements

Change-Id: I94977848735d8c19b3b769e238a4cc4e762c7618
Added Sahara Node Group Templates scenarios

One scenraio creates two types of node group templates and executes a
list operation.

The other creates and deletes popular types of node group templates.

Change-Id: Ie37151bb1ff195e6e0a67d85e693333da68f96e9
Merge "Updated from global requirements"
Merge "Added Sahara Node Group Templates scenarios"
Amended sphinx documents

Change-Id: I520b08202910ad476447fa09ca0a5993fc1bffc5