Adds update and delete agent tests

Adds tests for PUT and DELETE endpoints for the os-agents client
to test_agents_rbac.

Change-Id: I916061e8301876385f3bf1566ed6a2ac14f1467a
Closes-Bug: #1705796
diff --git a/releasenotes/notes/agents-ca4a5e232ce242a5.yaml b/releasenotes/notes/agents-ca4a5e232ce242a5.yaml
new file mode 100644
index 0000000..3cd9646
--- /dev/null
+++ b/releasenotes/notes/agents-ca4a5e232ce242a5.yaml
@@ -0,0 +1,5 @@
+---
+features:
+  - |
+    Added tests to test_agents_rbac.py for PUT and
+    DELETE endpoints.