Remove cookiedomain from gerrit config

The cookiedomain made it impossible to authenticate when using the
docker setup.

Change-Id: Iaa57dd425d028cdc6909d016de5e9b443086bdac

src/test/docker/etc/gerrit.config

diff --git a/src/test/docker/etc/gerrit.config b/src/test/docker/etc/gerrit.config
index d07b58b..a556df0 100644
--- a/src/test/docker/etc/gerrit.config
+++ b/src/test/docker/etc/gerrit.config
@@ -7,7 +7,6 @@
 [auth]
 	type = DEVELOPMENT_BECOME_ANY_ACCOUNT
 	trustContainerAuth = true
-	cookiedomain = localhost
 [sendemail]
 	smtpServer = localhost
 [sshd]