Waiting for gRPC disconnect to complete before removing BBSim device

Change-Id: I9c0e035a380dcc55ef20a2c0ef980f7ede66cc0a
diff --git a/tests/bbsim/Voltha_BBSimTests.robot b/tests/bbsim/Voltha_BBSimTests.robot
index 15769f0..b8083b8 100644
--- a/tests/bbsim/Voltha_BBSimTests.robot
+++ b/tests/bbsim/Voltha_BBSimTests.robot
@@ -176,6 +176,8 @@
     Run Keyword If    "${workflow}"=="DT"    Perform Sanity Test DT
     ...    ELSE IF    "${workflow}"=="TT"    Perform Sanity Tests TT
     ...    ELSE       Perform Sanity Test
+    # wait untill the device is connected again before proceeding
+    Sleep   10
 
 
 Setup Suite