[xcvrd] Tweak some transceiver info key names (sonic-net#62)

Change the following key names:

- hardwarerev -> hardware_rev
- serialnum -> serial
- manufacturename -> manufacturer
- modelname -> model
- Connector -> connector

Depends on sonic-net/sonic-platform-common#97

Author: jleveque

sonic-xcvrd/scripts/xcvrd

@@ -242,13 +242,13 @@ def post_port_sfp_info_to_db(logical_port_name, table, transceiver_dict,
             if port_info_dict is not None:
                 transceiver_dict[physical_port]=port_info_dict
                 fvs = swsscommon.FieldValuePairs([('type', port_info_dict['type']),
-                                                  ('hardwarerev', port_info_dict['hardwarerev']),
-                                                  ('serialnum', port_info_dict['serialnum']),
-                                                  ('manufacturename', port_info_dict['manufacturename']),
-                                                  ('modelname', port_info_dict['modelname']),
+                                                  ('hardware_rev', port_info_dict['hardware_rev']),
+                                                  ('serial', port_info_dict['serial']),
+                                                  ('manufacturer', port_info_dict['manufacturer']),
+                                                  ('model', port_info_dict['model']),
                                                   ('vendor_oui',port_info_dict['vendor_oui']),
                                                   ('vendor_date',port_info_dict['vendor_date']),
-                                                  ('Connector',port_info_dict['Connector']),
+                                                  ('connector',port_info_dict['connector']),
                                                   ('encoding',port_info_dict['encoding']),
                                                   ('ext_identifier',port_info_dict['ext_identifier']),
                                                   ('ext_rateselect_compliance',port_info_dict['ext_rateselect_compliance']),