Ups changes for new release

Updating content for user guide to reflect the new developer role and user mgmt section.

Besides that, I had to update a lot of screenshots, due to UI changes on UPS and KC


Done for https://issues.jboss.org/browse/AGPUSH-1085
On the 'choose role' part in Adding Users we mention:
'The only available and required role is the admin role, which you need to select on the Available Roles list"

This should be replaced with

"Choose the appropriate role for this user, either 'admin' or 'developer'. Once selected, shuffle it over to the Assigned Roles list"