(PIE-1064) CI testing SSL configuration

[coreymbe]

Summary

This commit configures the Splunk HEC endpoint with a Puppet CA certificate to test against SSL configuration.

Detailed Description

• spec/spec_helper_acceptance_local.rb
  • Adds ability to set ssl_ca and ignore_system_cert_store parameters in the manifest.
  • New function to add the Puppet CA cert to the splunk_hec config dir or system cert store.
  • New function to check Puppet Server log for HEC SSL related messages.
• spec/support/acceptance/splunk/defaults/default.yml
  • Enable SSL on the HEC endpoint of the Splunk container.
  • Ensure the serverCert setting is created in inputs.conf.
• spec/support/acceptance/start_splunk_instance.sh
  • New function to configure SSL certificates on Splunk HEC endpoint.

Checklist

[X] Unit Tests [X] Acceptance Tests [X] PR title is "(Ticket|Maint) Short Description" [X] Commit title matches PR title