Security issue: default API keys

**Describe the bug**

CompreFace has default demo services and default hardcoded API keys
- https://github.com/exadel-inc/CompreFace/issues/1035#issuecomment-1456389576
- https://github.com/exadel-inc/CompreFace/blob/ddf32da8245e2e6688c3ab6f60587fd3e31538c2/java/admin/src/main/resources/db/changelog/db.changelog-0.1.8.yaml#L31

So, it's possible to use some private instances of CompreFace if demo services were not removed just using default API keys.

**To Reproduce**

You can find CompreFace instances in such services like Netlas, Censys, Shodan and so on, just filtering pages with keyword `Compeface`. Netlas is giving 123 known instances: https://app.netlas.io/responses/?q=http.body%3ACompreface&page=1&indices=

**Expected behavior**

Demo services have randomly generated API keys.