everywhere: use different session cookie names

If the user is hosting the dashboard in the same domain as
their blog (with a nginx suburi, for example), the two session
cookies clash; logging into one service logs you out of the other.
With this patch, both have separate names.

Fixes https://gitlab.com/commento/commento-ce/issues/49

frontend/js/dashboard-import.js

@@ -12,9 +12,9 @@
     var data = global.dashboard.$data;
 
     var json = {
-      session: global.cookieGet("session"),
-      domain: data.domains[data.cd].domain,
-      url: url,
+      "ownerToken": global.cookieGet("ownerToken"),
+      "domain": data.domains[data.cd].domain,
+      "url": url,
     }
 
     global.buttonDisable("#disqus-import-button");