[VOL-4395] (Part of) Added support to enable/disable per-test voltha logging in bbsim based periodic job

Change-Id: I1fafbe7812d45ff38d0b8bcaee11a41a76b8994d
diff --git a/tests/functional/Voltha_MultiOLT_Tests.robot b/tests/functional/Voltha_MultiOLT_Tests.robot
index bfff1d3..c9cc74c 100755
--- a/tests/functional/Voltha_MultiOLT_Tests.robot
+++ b/tests/functional/Voltha_MultiOLT_Tests.robot
@@ -55,6 +55,10 @@
 # Per-test logging on failure is turned off by default; set this variable to enable
 ${container_log_dir}    ${None}
 
+# logging flag to enable Voltha Components Logging, can be passed via the command line too
+# example: -v logging:False
+${logging}    True
+
 *** Test Cases ***
 Verify OLT after rebooting physically - MultipleOLT
     [Documentation]    Test the physical reboot of the OLT