Remove the CONFIG_DB_INIT flag dependency on db_migrator (sonic-net#2959

)

- What I did
db_migrator should not depend on CONFIG_DB_INITIALIZED flag. get_hwsku api call busy waits on that flag

- How I did it
Replace get_hwsku call with get_localhost_info call which takes in a custom config_db object

Signed-off-by: Vivek Reddy Karri <vkarri@nvidia.com>

scripts/db_migrator.py

@@ -91,7 +91,8 @@ def __init__(self, namespace, socket=None):
         self.asic_type = version_info.get('asic_type')
         if not self.asic_type:
             log.log_error("ASIC type information not obtained. DB migration will not be reliable")
-        self.hwsku = device_info.get_hwsku()
+
+        self.hwsku = device_info.get_localhost_info('hwsku', self.configDB)
         if not self.hwsku:
             log.log_error("HWSKU information not obtained. DB migration will not be reliable")