PE-834, PE-424: fixes for cloud provisioner PE console interaction

Update the cloud provisioner to use the Puppet::Network::HTTP::Connection class correctly - a fix for PE-834.
While at it add the --insecure option to the command to make it possible to connect to PE console hosts without checking their SSL certificates. Note that that is impossible while using the mentioned Puppet::Network::HTTP::Connection class for PE console interaction as it always tries to verify the server certificate.  So when the --insecure option is specified the Net::HTTP class is used instead for the interaction.