Add validation from create Ticket. 
Add warning for non validated ticket
see #2969

git-svn-id: https://forge.indepnet.net/svn/glpi/trunk@21768 35612d4c-9d10-0410-837c-bf9dd1be60d7
Minor fixes

git-svn-id: https://forge.indepnet.net/svn/glpi/trunk@21769 35612d4c-9d10-0410-837c-bf9dd1be60d7