Skip fpm tests not designed to be run as root

When running as root with TEST_FPM_RUN_AS_ROOT=1

sapi/fpm/tests/bug68391-conf-include-order.phpt

@@ -3,6 +3,7 @@ FPM: bug68391 - Configuration inclusion in alphabetical order
 --SKIPIF--
 <?php
 include "skipif.inc";
+FPM\Tester::skipIfRoot();
 ?>
 --FILE--
 <?php

sapi/fpm/tests/proc-user-ignored.phpt

@@ -3,6 +3,7 @@ FPM: Process user setting ignored when FPM is not running as root
 --SKIPIF--
 <?php
 include "skipif.inc";
+FPM\Tester::skipIfRoot();
 ?>
 --FILE--
 <?php

sapi/fpm/tests/socket-uds-numeric-ugid-nonroot.phpt

@@ -3,6 +3,7 @@ FPM: UNIX socket owner and group settings can be numeric
 --SKIPIF--
 <?php
 include "skipif.inc";
+FPM\Tester::skipIfRoot();
 FPM\Tester::skipIfPosixNotLoaded();
 ?>
 --FILE--

sapi/fpm/tests/tester.inc

@@ -278,6 +278,16 @@ class Tester
         }
     }
 
+    /**
+     * Skip if running as root.
+     */
+    static public function skipIfRoot()
+    {
+        if (getmyuid() == 0) {
+            die('skip running as root');
+        }
+    }
+
     /**
      * Skip if posix extension not loaded.
      */