Introduce the hierarchy structure of graph/task/baseTask/job and the detail in workflow & task definitions.

Goals:

(1)Understand the workflow/task/baseTask/job relationship

Practice:

(1)List all source code files of Graph.InstallESXi (You don’t need to understand the source code)

(2)Using existing tasks to build your own graph, register it to RackHD and let it run successfully.

Extends:

(1)Familiar with the grep tool (grep, git grep, silversearch-ag) and hound code search system.

(2)Generate task annotation doc