oauth2_proxy config after bitly/oauth2_proxy#115

The cookie_refresh switched from time until expiration to time since creation,
which makes more sense. Also updated cookie_key to cookie_name.

deploy/usr/local/18f/etc/oauth2_proxy.cfg

@@ -44,11 +44,11 @@ authenticated_emails_file = "/home/ubuntu/hub/_site/auth/hub-authenticated-email
 cookie_secret = ""
 cookie_domain = ".18f.gov"
 cookie_expire = "168h"
-cookie_refresh = "144h"
+cookie_refresh = "24h"
 cookie_https_only = true
 
 ## To maintain backward compatibility so users won't have to refresh.
-cookie_key = "_oauthproxy"
+cookie_name = "_oauthproxy"
 
 ## MyUSA settings until staging.my.usa.gov change committed
 login_url = "https://staging.my.usa.gov/oauth/authorize"