Remove unnecessary "poo" rmdirs

"poo" was only used in the opendir_edgecases test, but rmdir'ed
in some other tests as well.

I've also taken the liberty of renaming this directory...

Author: nikic

ext/phar/tests/fgc_edgecases.phpt

@@ -43,7 +43,6 @@ include $pname . '/foo/hi';
 ===DONE===
 --CLEAN--
 <?php unlink(__DIR__ . '/' . basename(__FILE__, '.clean.php') . '.phar.php'); ?>
-<?php rmdir(__DIR__ . '/poo'); ?>
 <?php unlink(__DIR__ . '/fgc_edgecases.txt'); ?>
 --EXPECTF--
 Warning: file_get_contents() expects parameter 1 to be a valid path, array given in %sfgc_edgecases.php on line %d

ext/phar/tests/fopen_edgecases2.phpt

@@ -32,7 +32,6 @@ include $pname . '/foo/hi';
 ===DONE===
 --CLEAN--
 <?php unlink(__DIR__ . '/' . basename(__FILE__, '.clean.php') . '.phar.php'); ?>
-<?php rmdir(__DIR__ . '/poo'); ?>
 <?php unlink(__DIR__ . '/fopen_edgecases2.txt'); ?>
 --EXPECTF--
 Warning: fopen() expects parameter 1 to be a valid path, array given in %sfopen_edgecases2.php on line %d

ext/phar/tests/opendir_edgecases.phpt

@@ -14,10 +14,10 @@ $pname = 'phar://' . $fname;
 
 opendir(array());
 
-mkdir(__DIR__ . '/poo');
+mkdir(__DIR__ . '/opendir_edgecases');
 chdir(__DIR__);
 
-$a = opendir('poo');
+$a = opendir('opendir_edgecases');
 
 $arr = array();
 while (false !== ($b = readdir($a))) {
@@ -50,7 +50,7 @@ include $pname . '/foo';
 ===DONE===
 --CLEAN--
 <?php unlink(__DIR__ . '/' . basename(__FILE__, '.clean.php') . '.phar.php'); ?>
-<?php rmdir(__DIR__ . '/poo');
+<?php rmdir(__DIR__ . '/opendir_edgecases');
 --EXPECTF--
 Warning: opendir() expects parameter 1 to be a valid path, array given in %sopendir_edgecases.php on line %d
 .

ext/phar/tests/readfile_edgecases.phpt

@@ -32,7 +32,6 @@ include $pname . '/foo/hi';
 ===DONE===
 --CLEAN--
 <?php unlink(__DIR__ . '/' . basename(__FILE__, '.clean.php') . '.phar.php'); ?>
-<?php rmdir(__DIR__ . '/poo'); ?>
 <?php unlink(__DIR__ . '/readfile_edgecases.txt'); ?>
 --EXPECTF--
 Warning: readfile() expects parameter 1 to be a valid path, array given in %sreadfile_edgecases.php on line %d