run HTTP tests against EU server

this hopefully helps with recent problems of spradically failing tests.

_test/tests/inc/httpclient_http.test.php

@@ -3,7 +3,7 @@
 require_once (__DIR__ . '/httpclient_mock.php');
 
 class httpclient_http_test extends DokuWikiTest {
-    protected $server = 'http://httpbin.org';
+    protected $server = 'http://eu.httpbin.org';
 
 
     /**

_test/tests/inc/httpclient_http_proxy.test.php

@@ -3,7 +3,7 @@
 require_once (__DIR__ . '/httpclient_mock.php');
 
 class httpclient_http_proxy_test extends DokuWikiTest {
-    protected $url = 'http://httpbin.org/user-agent';
+    protected $url = 'http://eu.httpbin.org/user-agent';
 
     /**
      * @group internet
@@ -18,4 +18,4 @@ class httpclient_http_proxy_test extends DokuWikiTest {
         $this->assertFalse($data === false, 'HTTP response: '.$http->error.' ['.$this->url.']');
         $this->assertTrue(strpos($data,'DokuWiki') !== false, 'response content');
     }
-}
\ No newline at end of file
+}

_test/tests/inc/httpclient_https.test.php

@@ -2,7 +2,7 @@
 require_once dirname(__FILE__).'/httpclient_http.test.php';
 
 class httpclient_https_test extends httpclient_http_test {
-    protected $server = 'https://httpbin.org/';
+    protected $server = 'https://eu.httpbin.org/';
 
     public function setUp(){
         // skip tests when this PHP has no SSL support

_test/tests/inc/httpclient_https_proxy.test.php

@@ -2,7 +2,7 @@
 require_once dirname(__FILE__).'/httpclient_http_proxy.test.php';
 
 class httpclient_https_proxy_test extends httpclient_http_proxy_test {
-    protected $url = 'https://httpbin.org/user-agent';
+    protected $url = 'https://eu.httpbin.org/user-agent';
 
     public function setUp(){
         // skip tests when this PHP has no SSL support