Get geckodriver.log from 'tildefriends test -t auto' out of the root.

.gitignore

@@ -5,5 +5,4 @@ db.*
 deps/ios_toolchain/
 deps/openssl/
 dist/
-geckodriver.log
 out

tools/autotest.py

@@ -1,6 +1,7 @@
 #!/usr/bin/env python3
 
 from selenium import webdriver
+from selenium.webdriver.firefox.service import Service
 from selenium.webdriver.common.by import By
 from selenium.webdriver.support import expected_conditions
 from selenium.webdriver.support.ui import WebDriverWait
@@ -16,8 +17,9 @@ def exists_in_shadow_root(shadow_root, by, value):
 success = False
 try:
 	options = webdriver.FirefoxOptions()
+	service = Service(log_output = 'out/geckodriver.log')
 	#options.add_argument('--headless')
-	driver = webdriver.Firefox(options = options)
+	driver = webdriver.Firefox(options = options, service = service)
 	wait = WebDriverWait(driver, 10)
 	driver.get('http://localhost:8888')
 	driver.find_element(By.TAG_NAME, 'tf-navigation').shadow_root.find_element(By.LINK_TEXT, 'login').click()