Load the database global_db. (#1752)

What I did
Recent change was done to remove call to load database global_db which expects the clients to load global_db.
[#8173]
The load global_db was missing in multi_asic.py which was causing "show interfaces cli" to fail.
While testing on multi-asic VS image:
How I did it
load global_db config in multi_asic.py.

How to verify it
Load multi-asic VS image with the fix.
Signed-off-by: Suvarna Meenakshi <sumeenak@microsoft.com>

utilities_common/multi_asic.py

@@ -7,6 +7,7 @@
 from natsort import natsorted
 from sonic_py_common import multi_asic
 from utilities_common import constants
+from utilities_common.general import load_db_config
 
 
 class MultiAsic(object):
@@ -15,6 +16,8 @@ def __init__(
         self, display_option=constants.DISPLAY_ALL, namespace_option=None,
         db=None
     ):
+        # Load database config files
+        load_db_config()
         self.namespace_option = namespace_option
         self.display_option = display_option
         self.current_namespace = None