Revert certificate updates

[Lagovas]

Here I revert certificate changes in previous commit because of previous certificates used in our docker containers used in tests and stored in crl file and issues certs database used in tests. So I leaved added mysql certificates and added to index.txt. Plus I added support for HTTP requests to Acra when I adapted our examples. But due to unsupported TLS requests to API, I leaved it as is for future re-usage. I created task 2418 to add TLS support in acra-server.

Checklist

• [+] Change is covered by automated tests
• [+] The coding guidelines are followed
• [+] Public API has proper documentation in the Acra documentation site or has PR on documentation repository with new changes
• [+] CHANGELOG.md is updated (in case of notable or breaking changes)
• [+] CHANGELOG_DEV.md is updated
• [+] Benchmark results are attached (if applicable)
• + are up-to-date (in case of API changes)