Fix removeDevice function in onosclidriver

Change-Id: I200c7e2c0f0e7f6b1a8f2250fbcde5a84b70ff32
diff --git a/TestON/drivers/common/cli/onosclidriver.py b/TestON/drivers/common/cli/onosclidriver.py
index 5ed20ef..301eb43 100755
--- a/TestON/drivers/common/cli/onosclidriver.py
+++ b/TestON/drivers/common/cli/onosclidriver.py
@@ -4696,7 +4696,9 @@
         '''
         try:
             if type( device ) is str:
-                device = list( device )
+                deviceStr = device
+                device = []
+                device.append( deviceStr )
 
             for d in device:
                 time.sleep( 1 )