Migrate Strongbox from OrientDB to JanusGraph

[sbespalov]

Closes #1649.

[steve-todorov]

I have been thinking that we need to make these passwords randomly generated upon first boot so that one can safely use Strongbox in production. Could you please add a // TODO: [First start] randomize here and before any other similar field(s) you come across? This will need to be planned as a separate follow-up task. :)

[sbespalov]

done

[steve-todorov]

Thanks! :)

[carlspring]

We should probably have the default user/pass for this set to admin/password, as we're using this convention across the codebase already and we'll need to have a follow-up task to generate a password for this at the first boot. If we have different initial (default) credentials, it will make things more confusing (and we'll have to remember these).