Adds missing volumes client tests

Adds missing volumes client tests for set bootable, reserve,
unreserve, and update metadata actions, as well as renames update
metadata item and delete metadata items tests to properly represent
what actions they perform.

Change-Id: I75bbf62635f3476e658f5b162f5bd65f9fcaab08
Implements: bp: test-volumes-rbac
diff --git a/releasenotes/notes/volumes-client-tests-d697a4a75d3e1405.yaml b/releasenotes/notes/volumes-client-tests-d697a4a75d3e1405.yaml
new file mode 100644
index 0000000..5dc9ff3
--- /dev/null
+++ b/releasenotes/notes/volumes-client-tests-d697a4a75d3e1405.yaml
@@ -0,0 +1,8 @@
+---
+features:
+  - Added tests for volumes client functions set
+    bootable, reserve, unreserve, and update metadata.
+other:
+  - Renamed update metadata item and delete metadata
+    item tests to accurately reflect what actions are
+    being performed.