drop files_external tests from autotest - they will be executed with autotest-external.sh which is coming

tests/enable_all.php

@@ -19,7 +19,6 @@ function enableApp($app) {
 enableApp('files_sharing');
 enableApp('files_trashbin');
 enableApp('files_encryption');
-enableApp('files_external');
 enableApp('user_ldap');
 enableApp('files_versions');
 

tests/phpunit-autotest.xml

@@ -20,8 +20,7 @@
 			<exclude>
 				<directory suffix=".php">../3rdparty</directory>
 				<directory suffix=".php">../apps/files/l10n</directory>
-				<directory suffix=".php">../apps/files_external/l10n</directory>
-				<directory suffix=".php">../apps/files_external/3rdparty</directory>
+				<directory suffix=".php">../apps/files_external</directory>
 				<directory suffix=".php">../apps/files_versions/l10n</directory>
 				<directory suffix=".php">../apps/files_encryption/l10n</directory>
 				<directory suffix=".php">../apps/files_encryption/3rdparty</directory>