Improved integration tests

[VukW]

• now config.yaml location can be defined with custom value (env var)
• integration tests use a new /tmp/ folder storage with every run
• After every command db is backed up to /tmp/%dir%/snapshots/ for easy debug
• Every command is printed before execution

NB: despite of it simplifies tests rerun, one still need to reset db storage manually before tests run: ./reset_db.sh && python seed.py

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[VukW]

Hi @hasan7n thanks, you are right, moved config&storage init to tests_setup.sh.

Also updated "storage moving": instead of real moving files back and forth (that may be error-prone if broken on the mid) we explicitly point config pathes to a newly created empty tmp folder. That is safer IMO

[VukW]

@hasan7n fixed, ready for re-review:)