test-update: Simplify injected dump

No need to have a specific dump injected in this test.
It is enough to have the simplest dump just to create a few services for
one host. This will prevent possible flakes and it will reduce
maintanance efforts.

Change-Id: I092b523387aee4d581182c13d1250a0d9fddc206

Author: MatteoStifano

tests/update/conftest.py

@@ -114,7 +114,7 @@ def _setup(
     logger.info("Setting up test-site ...")
     test_site = create_site(base_package)
     try:
-        inject_dumps(test_site, DUMPS_DIR)
+        inject_dumps(test_site, DUMPS_DIR, check_dumps_up_to_date=False)
         create_password(test_site)
         disable_rules_injection = request.config.getoption(name="--disable-rules-injection")
         if not edition_from_env().is_cloud_edition():

tests/update/dumps/agent-2.4.0b1-docker

@@ -0,0 +1,2 @@
+<<<uptime>>>
+458