Alienvault OTX collector: library now offers verify and cert parameters

With AlienVault-OTX/OTX-Python-SDK#60 merged, the OTXv2 library can handle the parameters verify and cert. Those should be populated with our parameters http_verify_cert and ssl_ca_certificate.

cc maintainers of the bot @navtej @e3rd

https://github.com/AlienVault-OTX/OTX-Python-SDK/releases/tag/1.5.12