Some fixes for running in local cluster

[toban]

This sets the host headers and makes localhost requests use the platform-nginx

[toban]

The best way I've found to try this out is to apply the parent helmfile change then

1. log into the container

kubectl exec -it tool-quickstatements-<some_number> bash

2. install git

apt-get update && apt-get install git

3. remove or move the old magnustools folder, git clone this pull-request, and it shouldTM work

4. Create a wiki user, update the email verified by going into the database and manually doing it (wiki_dbs)

5. Goto http://<YOUR_WIKI>.localhost/tools/quickstatements/ click login and the oauth dance should start

6. Back in QS you should now be able to run batches etc.

[addshore]

This looks like quite a nice minimal change at this point, and only for local leaving prod as it is for now, which is probably fine for this low traffic path?
Though we might want to revisit in the future.

[addshore]

This should ideally come from an environment variable rather than be hardcoded.
Probably even if it is only used locally at this point (just spotted that below)