Refs #4270: Prepare version 3.0 of userManagement
Fixes #4270: Added an option to userManagement to handle the primary groups of new users
Merge pull request #259 from Kegeruneku/bug_4270/dev/4270_add_option_to_users_technique_to_handle_custom_groups

Fixes #4270: Added an option to userManagement to handle the primary gro...
Merge branch 'branches/rudder/2.6' into branches/rudder/2.9
Merge branch 'branches/rudder/2.9' into branches/rudder/2.10

Conflicts:
	techniques/systemSettings/userManagement/userManagement/3.0/metadata.xml
	techniques/systemSettings/userManagement/userManagement/3.0/userManagement.st