Add native facts to library/setup

This collects various facts from the host so that it isn't necessary to
have facter or ohai installed.  It gets various platform/distribution
facts, information about the type of hardware, whether a virtual
environment and what type, assorted interface facts, and ssh host public
keys.  Most facts are flat.  The two exceptions are 'processor' and all
interface facts.  Interface facts are presented as:
    ansible_lo : {
        "macaddress": "00:00:00:00:00:00",
        "ipv4": { "address": "127.0.0.1", "netmask": "255.0.0.0" },
        "ipv6": [
                    { "address": "::1", "prefix": "128", "scope": "host" }
                ]
    }