[sfputilbase.py] Add application_advertisement NA field to transceive…

…r_info_dict for platform api 1.0 (sonic-net#104)

Fixes the following bug reproduced on SONiC.HEAD.729-dirty-20200727.075328:
```
pmon#supervisord: xcvrd Traceback (most recent call last):
INFO pmon#supervisord: xcvrd   File "/usr/bin/xcvrd", line 1207, in <module>
INFO pmon#supervisord: xcvrd     main()
INFO pmon#supervisord: xcvrd   File "/usr/bin/xcvrd", line 1204, in main
INFO pmon#supervisord: xcvrd     xcvrd.run()
INFO pmon#supervisord: xcvrd   File "/usr/bin/xcvrd", line 1165, in run
INFO pmon#supervisord: xcvrd     self.init()
INFO pmon#supervisord: xcvrd   File "/usr/bin/xcvrd", line 1144, in init
INFO pmon#supervisord: xcvrd     post_port_sfp_dom_info_to_db(is_warm_start, self.stop_event)
INFO pmon#supervisord: xcvrd   File "/usr/bin/xcvrd", line 430, in post_port_sfp_dom_info_to_db
INFO pmon#supervisord: xcvrd     post_port_sfp_info_to_db(logical_port_name, int_tbl, transceiver_dict, stop_event)
INFO pmon#supervisord: xcvrd   File "/usr/bin/xcvrd", line 260, in post_port_sfp_info_to_db
INFO pmon#supervisord: xcvrd     ('application_advertisement',port_info_dict['application_advertisement'])])
INFO pmon#supervisord: xcvrd KeyError: 'application_advertisement'
```

Signed-off-by: Volodymyr Boyko <volodymyrx.boiko@intel.com>

sonic_platform_base/sonic_sfp/sfputilbase.py

@@ -832,6 +832,7 @@ def get_transceiver_info_dict(self, port_num):
             transceiver_info_dict['cable_length'] = 'N/A'
             transceiver_info_dict['specification_compliance'] = '{}'
             transceiver_info_dict['nominal_bit_rate'] = 'N/A'
+            transceiver_info_dict['application_advertisement'] = 'N/A'
 
         else:
             file_path = self._get_port_eeprom_path(port_num, self.IDENTITY_EEPROM_ADDR)
@@ -938,6 +939,8 @@ def get_transceiver_info_dict(self, port_num):
             transceiver_info_dict['ext_rateselect_compliance'] = sfp_interface_bulk_data['data']['RateIdentifier']['value']
             transceiver_info_dict['cable_type'] = "Unknown"
             transceiver_info_dict['cable_length'] = "Unknown"
+            transceiver_info_dict['application_advertisement'] = 'N/A'
+
             if sfp_type == 'QSFP':
                 for key in qsfp_cable_length_tup:
                     if key in sfp_interface_bulk_data['data']: