Allow puppetdb conn validation when ssl is disabled

for my use case, I am not able to validate the
ssl endpoint b/c I am creating my puppet certificates
during my puppet run, so they are not available to
the http get request.

This patch adds a new resource parameter to
the puppetdb_conn_validator that allows it
to make a non-ssl connection. This allows me
to declare my own http only resource that I
can use to verify the puppetdb connection.