Expose a low level raw way to call salt functions without the typechecking

[lucidd]

The idea is to provide a low level interface to call salt modules without the need to have a Call object. This should make it easy to call functions that are not implemented as Call objects yet.

[isbm]

Not exactly as low level, but add a generic type-less way of caller, which will enable to call anything as it is returning merely raw data that user will need to figure out by himself. Surely, it will add overhead of boilerplate code, but then users will have a choice:

• Implement new stuff & submit patch here. But this has downside as not everyone can do this due to the common internal company policies that forbids this.
• Use generic way with own boilerplate and then later replace, once library matches their expectations.