Added MT::Util::is_valid_ip BugzID: 112165
Fixed the validation rule of ip address.. BugzID: 112165
Fixed regex for IP address. BugzID: 112166
MT::Util::is_valid_ip became simpler. BugzID: 112165
Oops, is_valid_ip returns all. BugzID: 112165
Merge branch 'feature-restrict-access' into develop