Fix nova instance-action-list output field and order

'instance-action-list' is not possible to identify the order
and time of the specified instance actions.
This patch fixes the sort of 'Start_time' and add field.

Change-Id: If9e6aaf8eb631819bf8e1c915cb1da64d6fcd2f4
Implements: blueprint instance-action-list-output
Add 'flavor-list --all' admin switch

Nova gives admins public flavors and flavors from their own projects
only by default. For flavor management, admins need to see all flavors
regardless of access.

Changes:
- Adds an 'is_public' argument to flavors.list() that mirrors the
  Nova API. is_public=None can be used to see all flavors.
- Adds an --all switch to flavor-list in the CLI for use by admins
  when all flavors are wanted.

Fixes bug 1172179.

Change-Id: I915cd2d8266cb6e32c80691a6ff27d8a23488c98
Merge "Fix nova instance-action-list output field and order"