Report company-affiliation-changes

Implemented report company-affiliation-changes.
The report shows affiliation changes of users given in default_data.json.
The report shows affiliation changes between certain start-date and end-date.
The result are given in table.

Change-Id: I6ed448448672b5dda9c58d8fe20f1cf04cb0d669
Implements: blueprint company-affiliation-changes