* Adds another module utility file which generalizes the
access of urls via the urllib* libraries.
* Adds a new spec generator for common arguments.
* Makes the user-agent string configurable.
Fixes#6211
1. if accept_hostkey is false, no matter if the host key is known or not, it will fail.
2. We don't check for the host key in /etc/ssh/ssh_known_hosts
This fixes both of those issues.