Tests all the fluent-bit versions (#8)

Adds integration tests for all the currently supported fluent-bit
versions.

tests/integration/test_fluent_bit.py

@@ -3,6 +3,7 @@
 #
 import logging
 
+import pytest
 from k8s_test_harness import harness
 from k8s_test_harness.util import env_util, k8s_util
 
@@ -11,9 +12,12 @@
 LOG = logging.getLogger(__name__)
 
 
-def test_integration_fluent_bit(module_instance: harness.Instance):
+@pytest.mark.parametrize("image_version", ("2.1.6", "1.9.5"))
+def test_integration_fluent_bit(
+    function_instance: harness.Instance, image_version: str
+):
     fluent_bit_rock = env_util.get_build_meta_info_for_rock_version(
-        "fluent-bit", "2.1.6", "amd64"
+        "fluent-bit", image_version, "amd64"
     )
 
     images = [k8s_util.HelmImage(fluent_bit_rock.image)]
@@ -27,6 +31,6 @@ def test_integration_fluent_bit(module_instance: harness.Instance):
         images=images,
     )
 
-    module_instance.exec(helm_command)
+    function_instance.exec(helm_command)
 
-    k8s_util.wait_for_daemonset(module_instance, "fluent-bit", "fluent-bit")
+    k8s_util.wait_for_daemonset(function_instance, "fluent-bit", "fluent-bit")