Add warnings to the Puppet module if HTTPS not being used to talk to Conjur

[diverdane]

Is your feature request related to a problem? Please describe.

The Puppet module should generate a warning (or even better, fail) whenever HTTP is being used to communicate with Conjur rather than HTTPS.

Describe the solution you would like

Definition of Done (DoD):

• The puppet module generates a warning when HTTP is used to communicate with Conjur
  for either Puppet master or Puppet agent, rather than HTTPS.
• Extra credit: The puppet module errors out when HTTP is used to communicate with Conjur,
  rather than HTTPS.

Describe alternatives you have considered

Additional context