[0.85] mising commit


git-svn-id: https://forge.indepnet.net/svn/glpi/branches/0.85-work@21279 35612d4c-9d10-0410-837c-bf9dd1be60d7
[0.85] clean networkport migration on purge


git-svn-id: https://forge.indepnet.net/svn/glpi/branches/0.85-work@21281 35612d4c-9d10-0410-837c-bf9dd1be60d7