Add SSL verification control

New configuration parameter ssl allows control on using SSL when accessing the data source site.

FVM site moved to using Netlock issued certificates on 4-Jan-2024. Most of the hosts do not have their CA store updated with the issuer root/intermediate certificates which will prevent getting FVM data throwing error:
_ssl.SSLCertVerificationError: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (ssl.c:1002)

This change allows bypassing SSL certificate check.

See more information on README.