[VOL-2843] add timeout between disable and delete of devices

Change-Id: I6b2e6d70eb190e18e3ffdf57b759bf14fbd2a6ce
diff --git a/libraries/utils.robot b/libraries/utils.robot
index e2cb049..2646788 100644
--- a/libraries/utils.robot
+++ b/libraries/utils.robot
@@ -284,8 +284,10 @@
     [Documentation]    Remove any devices from VOLTHA and ONOS
     # Clear devices from VOLTHA
     Disable Devices In Voltha    Root=true
+    Sleep    5s
     Wait Until Keyword Succeeds    ${timeout}    2s    Test Devices Disabled In Voltha    Root=true
     Delete Devices In Voltha    Root=true
+    Sleep    30s
     Wait Until Keyword Succeeds    ${timeout}    2s    Test Empty Device List
     # Clear devices from ONOS
     #Remove All Devices From ONOS