tests, docker(e2e): added e2e tests for Libervia:

- moved jp tests to `e2e/jp`
- new fixtures
- adapted docker-compose
- improved `run_e2e` with several flags + report on failure
- doc to come

docker/docker-compose_e2e.yml

@@ -42,6 +42,10 @@ services:
     image: salutatoi/sat_e2e
     environment:
       SAT_TEST_ENV_E2E: "1"
+      SAT_TEST_ENV_E2E_LIBERVIA: "1"
+    ports:
+      # VNC server for Libervia e2e tests visual mode
+      - 5900
     networks:
       default:
         aliases:
@@ -57,3 +61,7 @@ services:
     ports:
         - "8080"
         - "8443"
+    networks:
+      default:
+        aliases:
+          - libervia.test