Built-in support for ohai-solo as a sysinfo provider.

Provide a module that will allow satori to perform cross-platform data plane discovery through ohai-solo, adhering to the System Info Proposal implementation. ohai-solo is a package used to examine individual host machines and return JSON output of its results.

Requirements:

    In order to be ohai-solo capable, it needs to automate the following, for any discovered system :

        1. Request and understand package information from ohai-solo's upstream package archive
        2. Determine enough remote platform info to be able to select the correct ohai-solo package
        3. Download the package (probably using wget)
        4. Perform an install of the package
        5. Check the version of an existing ohai-solo package
        6. Update ohai-solo if needed
        7. Uninstall ohai-solo
        8. Gracefully handle any common errors when running ohai-solo
        9. Return the JSON output from ohai-solo as a python dictionary

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For information about satori's current sysinfo concepts:
    * https://blueprints.launchpad.net/satori/+spec/poc-system-info
    * https://wiki.openstack.org/wiki/Satori/SystemInfoProposal

For more information about the ohai-solo project:
    * https://github.com/rackerlabs/ohai-plugins#ohai-solo
    * https://github.com/ryandub/omnibus-ohai-solo#ohai-solo-omnibus-project

The following requirements will leverage an ssh module.
For more information about the ssh module for satori:
    * https://wiki.openstack.org/wiki/Satori/SSHModuleProposal
    * https://blueprints.launchpad.net/satori/+spec/ssh-module