npm start fail on systems with OpenSSL >= 1.1.1

[RuneStone0]

The bug
npm start will fail on systems with OpenSSL >= 1.1.1

How to reproduce

1. Use latest version of Kali Linux or modify /etc/ssl/openssl.cnf and set CipherString to DEFAULT@SECLEVEL=2
2. Run npm start

This will throw an error:

$ npm start

> BitShares2-light@3.3.191120 start /tmp/ui
> cross-env NODE_ENV=development node server.js

_tls_common.js:135              
      c.context.setCert(cert);
                ^

Error: error:140AB18F:SSL routines:SSL_CTX_use_certificate:ee key too small
    at Object.createSecureContext (_tls_common.js:135:17)
    at Server (_tls_wrap.js:873:27)
    at new Server (https.js:62:14)
    at Object.createServer (https.js:85:10)
    at Object.<anonymous> (/tmp/blockbasis-bitshares-ui/ui/server.js:61:7)
    at Module._compile (internal/modules/cjs/loader.js:778:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:789:10)
    at Module.load (internal/modules/cjs/loader.js:653:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:593:12)
    at Function.Module._load (internal/modules/cjs/loader.js:585:3)
    at Function.Module.runMain (internal/modules/cjs/loader.js:831:12)
    at startup (internal/bootstrap/node.js:283:19)
    at bootstrapNodeJSCore (internal/bootstrap/node.js:623:3)

Additional information about the issue: https://wiki.debian.org/ContinuousIntegration/TriagingTips/openssl-1.1.1

Solution
Generate 2048 bit long keys.