Config environment variable CONJUR_TRUST_SSL_CERTIFICATE

[AndrewCopeland]

Is your feature request related to a problem? Please describe.
I do not want to put the Conjur self-signed certificate on ever one of my PKI services. This feature will only be used for POC.

Describe the solution you'd like
When deploying the PKI service I would like to have an environment variable such as CONJUR_TRUST_SSL_CERTIFICATE which if set to true or yes will reach out to the CONJUR_APPLIANCE_URL and retrieve the certificate and store it on the PKI service locally. Then when making other HTTP requests we will use the certificate retrieved.

This is helpful when trying to stand up the pki-service quickly.

Describe alternatives you've considered
Nope

Additional context
.