Update check script

* GitLab Shell 1.7.1 is required
* Global projects are not supported (refs #5152)

lib/tasks/gitlab/check.rake

@@ -22,6 +22,7 @@ namespace :gitlab do
       check_tmp_writable
       check_init_script_exists
       check_init_script_up_to_date
+      check_projects_have_namespace
       check_satellites_exist
       check_redis_version
       check_git_version
@@ -552,6 +553,32 @@ namespace :gitlab do
       end
     end
 
+    def check_projects_have_namespace
+      print "projects have namespace: ... "
+
+      unless Project.count > 0
+        puts "can't check, you have no projects".magenta
+        return
+      end
+      puts ""
+
+      Project.find_each(batch_size: 100) do |project|
+        print "#{project.name_with_namespace.yellow} ... "
+
+        if project.namespace
+          puts "yes".green
+        else
+          puts "no".red
+          try_fixing_it(
+            "Migrate global projects"
+          )
+          for_more_information(
+            "doc/update/5.4-to-6.0.md in section \"#global-projects\""
+          )
+          fix_and_rerun
+        end
+      end
+    end
 
     # Helper methods
     ########################
@@ -659,7 +686,7 @@ namespace :gitlab do
   end
 
   def check_gitlab_shell
-    required_version = Gitlab::VersionInfo.new(1, 7, 0)
+    required_version = Gitlab::VersionInfo.new(1, 7, 1)
     current_version = Gitlab::VersionInfo.parse(gitlab_shell_version)
 
     print "GitLab Shell version >= #{required_version} ? ... "