Bump stackhpc.drac role

This new version fixes the evaluation of check_mode, which is causing
`kayobe overcloud bios raid configure` to fail.

Change-Id: I9c6e261dbac067ca3f9218e6ea81813ddc2f6520
(cherry picked from commit 5d6b971)

Author: priteau

requirements.yml

@@ -24,7 +24,7 @@ roles:
   - src: stackhpc.dell-powerconnect-switch
     version: v1.1.0
   - src: stackhpc.drac
-    version: 1.1.5
+    version: 1.1.6
   - src: stackhpc.drac-facts
     version: 1.0.0
   - src: stackhpc.grafana-conf