Do not cover composer folders for code coverage

Signed-off-by: Roeland Jago Douma <roeland@famdouma.nl>

tests/phpunit-autotest.xml

@@ -42,6 +42,7 @@
 				<directory suffix=".php">../tests</directory>
 				<directory suffix=".php">../build</directory>
 				<directory suffix=".php">../lib/composer</directory>
+				<directory suffix=".php">../apps/*/composer</directory>
 			</exclude>
 		</whitelist>
 	</filter>