Fix sudo config ntp add no longer working

Signed-off-by: Saikrishna Arcot <sarcot@microsoft.com>

Author: saiarcot895

config/main.py

@@ -8203,7 +8203,9 @@ def enable(enable):
 @click.pass_context
 def ntp(ctx):
     """NTP server configuration tasks"""
-    if 'db' not in ctx.obj:
+    # This is checking to see if there is a db attribute present in ctx.obj,
+    # to differentiate it between unit test scenario and runtime scenario.
+    if 'db' not in dir(ctx.obj):
         config_db = ConfigDBConnector()
         config_db.connect()
         ctx.obj = {'db': config_db}