create groups when autoinit'ing an idprovider

[espen42]

Add feature to also create groups with permissions when autoinit'ing an idprovider

[espen42]

Syntax suggestion
For instructing autoinit to look for (and create if not exist) the groups admins and other for an autoinit'ed idprovider named test, both with the role system.admin.login, and the admin group with the additional roles system.user.app and system.admin:

groups.initRoles.test.admins=["system.user.app", "system.admin", "system.admin.login"]
groups.initRoles.test.other=["system.admin.login"]

# Maybe even...
groups.description.test.admins="These are admins"

[espen42]

Opinions? @rymsha , @poi33 , @sigdestad

[poi33]

If this will be used a lot by others go for it.

[rymsha]

We don't plan to have this feature for now