Manage remote media state transitions

This is a first part of bigger functionality which provides host to use
virtual media.
First part provides skeleton and definitions of states and events defining
state machine, also brings working implementation of proxy mode and some
starting point to implement legacy mode.
There are at least three additional patchsets implementing legacy mode with
https and cifs support and secure passing of secrets.

Specifically this change adds StateMachine class used to keep track state of
each mount point:
- StateMachine is made as std::variant of object derived from BasicState.
- Each state has its own possible transitions defined (events).
- Transitions defines appropriate behavior.
- Specific event triggers transition from one to other specific state (1:1
relation).

Tested:
Manual tests on WilsonCity platform:
- mounting and unmounting using redfish and webui
- check state on dbus interfaces

Change-Id: I4b13085e1f8884fcedd7d97e76910c21e87ab7f8
Signed-off-by: Rapkiewicz, Pawel <pawel.rapkiewicz@intel.com>
Signed-off-by: Czarnowski, Przemyslaw <przemyslaw.hawrylewicz.czarnowski@intel.com>

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