Rename add_user_to_project_teams to gitlab:import:user_to_projects

doc/raketasks/user_management.md

 ### Add user to as a developer to all projects
 
 ```
-bundle exec rake add_user_to_project_teams[username@domain.tld]
+bundle exec rake gitlab:import:user_to_projects[username@domain.tld]
 ```
 
 
@@ -12,5 +12,5 @@ Notes:
 * admin users are added as masters
 
 ```
-bundle exec rake add_users_to_project_teams
+bundle exec rake gitlab:import:all_users_to_all_projects
 ```

lib/tasks/bulk_add_permission.rake → lib/tasks/gitlab/bulk_add_permission.rake

-desc "Add all users to all projects (admin users are added as masters)"
-task :add_users_to_project_teams => :environment  do |t, args|
+namespace :gitlab do
+  namespace :import do
+    desc "GITLAB | Add all users to all projects (admin users are added as masters)"
+    task :all_users_to_all_projects => :environment  do |t, args|
       user_ids = User.where(:admin => false).pluck(:id)
       admin_ids = User.where(:admin => true).pluck(:id)
 
@@ -9,12 +11,14 @@ task :add_users_to_project_teams => :environment  do |t, args|
         puts "Importing #{admin_ids.size} admins into #{project.code}"
         UsersProject.bulk_import(project, admin_ids, UsersProject::MASTER)
       end
-end
+    end
 
-desc "Add user to as a developer to all projects"
-task :add_user_to_project_teams, [:email] => :environment  do |t, args|
+    desc "GITLAB | Add a specific user to all projects (as a developer)"
+    task :user_to_projects, [:email] => :environment  do |t, args|
       user = User.find_by_email args.email
       project_ids = Project.pluck(:id)
 
       UsersProject.user_bulk_import(user, project_ids, UsersProject::DEVELOPER)
+    end
+  end
 end
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