bug #1001 revert fixtures db change (dmaicher)

This PR was merged into the master branch.

Discussion
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revert fixtures db change

This fixes #998

The issue was that the fixture db data contained user passwords using `argon2` encoder algo which is not implemented in php 7.1 afaik. So authentication failed in the tests.

So this reverts the db changes done in 6c32238.

Build is green now 😉

Commits
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a3fb81b revert fixtures db change

Author: javiereguiluz