* add initial support to allow self-signed certs

When using self-signed the metrics collection will fail, this will allow
the user to specify in the input configuration file if they want to skip
certificate verification. This is functionally identical to `curl -k`

At some point this functionality should be moved to the agent as it is
already implemented identically in several different input plugins.

* Add initial comment strings to remove noise

These should be properly fleshed out at some point to ensure
code completeness

* refactor to use generic helper function

* fix import statement against fork

* update changelog