Don't auto-trust servers by default when creating remote shares (#26424)

This makes sure that only admins who really want this feature must
opt-in instead of opt-out.

apps/federation/lib/TrustedServers.php

@@ -135,7 +135,7 @@ class TrustedServers {
 	 * @return bool
 	 */
 	public function getAutoAddServers() {
-		$value = $this->config->getAppValue('federation', 'autoAddServers', '1');
+		$value = $this->config->getAppValue('federation', 'autoAddServers', '0');
 		return $value === '1';
 	}
 

apps/federation/tests/TrustedServersTest.php

@@ -170,7 +170,7 @@ class TrustedServersTest extends TestCase {
 	 */
 	public function testGetAutoAddServers($status, $expected) {
 		$this->config->expects($this->once())->method('getAppValue')
-			->with('federation', 'autoAddServers', '1')->willReturn($status);
+			->with('federation', 'autoAddServers', '0')->willReturn($status);
 
 		$this->assertSame($expected,
 			$this->trustedServers->getAutoAddServers()