Improve wizard steps.

Add flavor for creating cluster

Move subnets from OS Global page to Network page

Add find-new-servers on Server Selection page
(Improve find-new-servers code by using directive)

Combine interface and autofill on Network page

Add OS Global section on Review page

Remove swipe on wizard

Simplify wizard step and commit control

Move monitoring part to an individual module

Change-Id: I8422506270c428a7f84679cfbff542235ccc556f