Added several flags to execute particular tasks
Examples of commands below:
Next command will execute only tasks specified in tasks parameter
fuel node --node 2 --tasks hiera netconfig
Command with skip, will requests all tasks and remove tasks in skip
parameter
fuel node --node 2 --skip hiera netconfig
Command with end flag, will requests all tasks up to the end node in graph
and execute them
fuel node --node 2 --end hiera
Also end can be combined with skip, and then part of graph will be fetched and
part of graph removed
fuel node --node 2 --end netconfig --skip hiera netconfig
implements blueprint granular-deployment-based-on-tasks
Change-Id: I48340bdabe8c1aabc2e47b1a2e153618742981d2