The URL scheme for downloading plugins has changed a long time ago and
the used URL is dead. Gerrit only throws an error since it can't load
the plugin but it continues to boot. However, instead of maintaining
URLs to 3rdparty plugins, which end up dead anyway, just drop it. The
test should cover Gerrit and not 3rd party plugins.
Also, while on it, drop the setting `plugins.allowRemoteAdmin = true`
since it's not needed.
Signed-off-by: Felix Singer <felixsinger@posteo.net>
the default hasn't been changed since 2009
this can improve our test performances
nixos/tests: remove explicit memorySize <1024
1024MiB is now the default
