Add verify ssl parameter to letencrypt script

[rexit1982]

Adding verify_acme_ssl parameter to toggle if the ACME server's SSL cert is verified. Controlscript container seems to use the OS root store for validation. In cases where a private CA or self-signed cert has been used on the ACME server even importing the CA chain in the UI does not permit cert management operations.
It was also necessary to update the default API version to 21.1.1 from 20.1.1 for this to work against a 31.1.2 controller. Do not expect this to be an issue since 20.x is out of support and I do not believe 20.x ever had certificate management profile.