Add shell arguments for stack update

add option timeout for do_update,which has been added
for do_stack_update already.

add option rollback for stack update, this is supported
already in heat[1].

[1]https://github.com/openstack/heat/commit/7c833ecc2ba27053b7e948667a39a261f68144b5

Change-Id: I4545aef556c4c3297c2993418df2ec2cd7c4e408
Partial-Bug: #1324366
Merge "Add shell arguments for stack update"