killall and pgrep updates.

Set --ns $$ on commands.

emhttp/plugins/dynamix/include/Helpers.php

@@ -263,7 +263,7 @@ function urlencode_path($path) {
   return str_replace("%2F", "/", urlencode($path));
 }
 function pgrep($process_name, $escape_arg=true) {
-  $pid = exec("pgrep ".($escape_arg?escapeshellarg($process_name):$process_name), $output, $retval);
+  $pid = exec('pgrep --ns $$ '.($escape_arg?escapeshellarg($process_name):$process_name), $output, $retval);
   return $retval==0 ? $pid : false;
 }
 function is_block($path) {
@@ -372,7 +372,7 @@ function my_rmdir($dirname) {
         'dataset' => $zfsdataset,
         'type' => $fstype,
         'cmd' => $cmdstr,
-        'error' => $error,
+        'error' =>
       ];
       break;
     case "btrfs":