Add multiple postgis DB and tests

[Gustry]

Following the discussion with @mdouchin

• Add in the docker-compose a clone
• Add test for testing a YML file

test 1:
    - description: "Ce test fait truc"
    - query:
        - database: clone_a
        - sql: UPDATE machin
    - sleep:
        - duration: 0.5
    - query:
        - database: central
        - sql: UPDATE machin
    - synchro:
        - from: clone_a
        

Other things to do:

• be able to run a single test, because it might get long quickly
• clean old files from lizsync/test/data
• remove run_test.sh when it will be incorporated in the real python test

[Gustry]

Example service file:

[lizsync_central]
host=localhost
dbname=lizsync_central
user=lizsync
port=5432
password=***

[lizsync_clone_a]
host=localhost
dbname=lizsync_clone_a
user=lizsync
port=5432
password=***

[lizsync_clone_b]
host=localhost
dbname=lizsync_clone_b
user=lizsync
port=5432
password=***

./run_test.sh

[Gustry]

First part is done in the #13.

I have edited my bullet list above with some things to continue with later, according to how it will go with this first step.