Runtime discovery of the system characteristics

[atenart]

Runtime discovery of what is running, in which version, etc might be handy for:

• Automatically starting default collectors which have a dependency on a daemon or userspace part, or loaded kernel module.
• Allow to change the behavior of collectors based on the versions found on a system. Capabilities might be restricted.
• We also might have an automatic mode enabling all collectors retrieving information from what is running on a given machine.

[atenart]

Closed in favor of #100.