Update cover fake set position

[calielc]

Changed the behavior of the FakeMode:

1. it starts with Unknow current_position
2. if the user moves up/down its wont change the current_position (it remaing unknow)
3. to the current_position became valid, needs:

• close by SpanTime (when this happen we know for sure that the position is 0)
• open by SpanTime (when this happen we know for sure that the position is 100)
• setPosition, the first time the cover will be fully close and then move to the desired position

[calielc]

Hi guys, what do you think about this implementation?
Can i improve it in some aspect?

[rospogrigio]

Sorry @calielc , I just took a look at this and I'm afraid that PR #213 is even improving this implementation, can you please test it and report your feedback? I would close this PR if you agree so. Let me know, thanks

[rospogrigio]

Closing because being fulfilled in #213 .