Allow all users to write

[dryewo]

Currently it checks the uid in the special list:
https://github.com/zalando-stups/kio/blob/master/src/org/zalando/stups/kio/api.clj#L42

This should be allowed to any user that has the correct scope.

please, @prayerslayer :)

[prayerslayer]

Hi! All users can write, the limitation is just for

• the special endpoint for an app's criticality level which will be removed soon and
• the application.write_all scope which we don't want to give out to everybody easily.

[hjacobs]

@prayerslayer our use case is "Cloud Kraken" for managed Jenkins (needs to create app versions (still) for Jenkins slaves)