WL#4189 Wrap the check for socket path length in eval

mysql-test/lib/My/Platform.pm

@@ -102,14 +102,22 @@ sub check_socket_path_length {
 
   require IO::Socket::UNIX;
 
-  my $sock = new IO::Socket::UNIX
+  my $sock;
+  eval {
+    $sock= new IO::Socket::UNIX
       (
        Local => $path,
        Listen => 1,
       );
+  };
+  if ($@)
+  {
+    print $@, '\n';
+    return 2;
+  }
   if (!defined $sock){
     # Could not create a UNIX domain socket
-    return 0; # Ok, will not be used by mysqld either    
+    return 3;
   }
   if ($path ne $sock->hostpath()){
     # Path was truncated