As a site administrator I should be able to define the roles and teams the users will have when becoming members of his site

The main goal of this feature is to allow site administrator to specify which should be the
permissions of members by default by setting the default Site Roles that should be assigned to
users when they become members. For consistency, it should also be allowed to specify the
default Teams to which a user is added when becoming a member.

This functionality is very useful in those sites where it is desired that by default all users have
certain privileges but there could be some of them which are taken away such roles. For
example, by default a user could be a Site Member (always needed) plus an Advanced Site
Member, but at a later time that user could be removed the Advanced Site Member role and stay
as a regular member. It also allows to provide more permissions by defaults to the members of
some sites and fewer permissions to the members of other sites.

Steps to test this new feature:

• Test Preparation

Create a new site
Create a new site role
Create a new team in the new site
Create a new user

Go to "Site settings"
Add the role as the default role for the site
Add the team as the default team for the site

Go to "Site membership"
Click on "Add members" - "User"
Choose the new user and click on "Save"

• Verification

1) Go to "Site membership"
Click on "View teams"
Click on "Assign members" in your team
-> you should see your user as a member of the team

2) Go to "Users and Organizations" (in the "Portal" section of the control panel)
Click on the new user - roles section
-> you should see that the user has the site role assigned