Remove calls to deprecated each() in Library & tests

XmlRpc is not used by Magento, Marketplace, or other Zend modules,
and removing it was much easier than trying to refactor the recursive function where each() was used

library/Zend/Cache/Backend.php

@@ -76,7 +76,7 @@ public function __construct(array $options = array())
     public function setDirectives($directives)
     {
         if (!is_array($directives)) Zend_Cache::throwException('Directives parameter must be an array');
-        while (list($name, $value) = each($directives)) {
+        foreach ($directives as $name => $value) {
             if (!is_string($name)) {
                 Zend_Cache::throwException("Incorrect option name : $name");
             }

library/Zend/Config/Yaml.php

@@ -289,7 +289,7 @@ protected static function _decodeYaml($currentIndent, &$lines)
     {
         $config   = array();
         $inIndent = false;
-        while (list($n, $line) = each($lines)) {
+        foreach ($line as $n => $line) {
             $lineno = $n + 1;
 
             $line = rtrim(preg_replace("/#.*$/", "", $line));

library/Zend/Http/UserAgent/Features/Adapter/TeraWurfl.php

@@ -88,7 +88,7 @@ public static function getAllCapabilities(TeraWurfl $wurflObj)
             if (!is_array($group)) {
                 continue;
             }
-            while (list ($key, $value) = each($group)) {
+            foreach ($group as $key => $value) {
                 if (is_bool($value)) {
                     // to have the same type than the official WURFL API
                     $features[$key] = ($value ? 'true' : 'false');