Login automatically directly as Mentat user.

(Redmine issue: #7041)

Vagrantfile

@@ -31,6 +31,6 @@ Vagrant.configure('2') do |config|
   SHELL
 
   # Automatically connect as 'mentat' user with ssh command.
-  #VAGRANT_COMMAND = ARGV[0]
-  #config.ssh.username = 'mentat' if VAGRANT_COMMAND == 'ssh'
+  VAGRANT_COMMAND = ARGV[0]
+  config.ssh.username = 'mentat' if VAGRANT_COMMAND == 'ssh'
 end