[FIX] rating: improve parent container satisfaction computation

Currently rating globally allows 3 values for customers through email
requests: 5, 3 and 1. Through other means (frontend use of rating widget)
values from 5 to 1 are possible.

Only 5 is considered as a valid value for parent container satisfaction.
This leads to strange situation where a document with 4, 4, 4 and 5 has
only 25% of satisfaction.

This is considered as a bit harsh. In this commit we move the "satisfied"
limit of parent container as being above the "ok" value (aka, 4 and 5).

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