remove cache ttl tests, take a lot of time and don't work correctly for most backends anyway

tests/lib/cache.php

@@ -66,16 +66,4 @@ abstract class Test_Cache extends UnitTestCase {
 		$this->assertFalse($this->instance->hasKey('2_value1'));
 		$this->assertFalse($this->instance->hasKey('3_value1'));
 	}
-
-	function testTTL() {
-		$value='foobar';
-		$this->instance->set('value1',$value,1);
-		$value2='foobar';
-		$this->instance->set('value2',$value2);
-		sleep(2);
-		$this->assertFalse($this->instance->hasKey('value1'));
-		$this->assertNull($this->instance->get('value1'));
-		$this->assertTrue($this->instance->hasKey('value2'));
-		$this->assertEqual($value2,$this->instance->get('value2'));
-	}
 }

tests/lib/cache/apc.php

@@ -28,9 +28,4 @@ class Test_Cache_APC extends Test_Cache {
 		}
 		$this->instance=new OC_Cache_APC();
 	}
-
-	function testTTL() {
-		// ttl doesn't work correctly in the same request
-		// see https://bugs.php.net/bug.php?id=58084
-	}
 }

tests/lib/cache/xcache.php

@@ -28,8 +28,4 @@ class Test_Cache_XCache extends Test_Cache {
 		}
 		$this->instance=new OC_Cache_XCache();
 	}
-
-	function testTTL() {
-		// ttl doesn't work correctly in the same request
-	}
 }