Use CI_PIPELINE_ID instead of CI_PIPELINE_IID

CI_PIPELINE_ID is exposed in gitlab CI web interface,
so droplets are more easy to debug.

.gitlab-ci.yml

@@ -89,4 +89,4 @@ terminate:
   script:
     # Remove droplet after successful tests
     - cd test/
-    - python3 -c "import cosmos; cosmos.terminate_droplets_by_name(\"^ci-${CI_PIPELINE_IID}\$\")"
+    - python3 -c "import cosmos; cosmos.terminate_droplets_by_name(\"^ci-${CI_PIPELINE_ID}\$\")"

test/ci-bootstrap.py

@@ -116,11 +116,11 @@ if __name__ == "__main__":
         # - 411: ci, ed25519
         # - 407: varac
 
-        if "CI_PIPELINE_IID" in os.environ:
-            instance_id = os.environ['CI_PIPELINE_IID']
+        if "CI_PIPELINE_ID" in os.environ:
+            instance_id = os.environ['CI_PIPELINE_ID']
         else:
             # Use random generated ID in case we're not running in gitlab CI
-            # and there's no CI_PIPELINE_IID env var
+            # and there's no CI_PIPELINE_ID env var
             instance_id = ''.join(
                 random.choice(string.ascii_lowercase + string.digits)
                 for _ in range(10))