Fix issue in Network Interface page

The Jira ticket is:

https://arraynetworks.atlassian.net/browse/TWSD-1644
I addressed 3 parts in this ticket:

1. Fix issue in query_system_info API:

The CLI show debug sslcard is not working,

so it cause the result of card_type_list is empty, so it will raise key exception for the original code card_type_list[each_id+'-ssl'+item["ssl_id"]].

Thus, I set the value of the field card_type to empty string instead.

You can see attachment for reference of the CLI result.

2. Revert the code of VA instance API

Because the code of VA instance API is based on reading/writing a config/cache file,

it will slow down the API and may cause data inconsistance.

3. Fix system stop by the API: /api/avx/network/interface/TrafficInterface/_get_list_data?key=["model","physical_name","domain","interface_name","mac","mtu","available","interface_status"]

The root cause is there is no model data in some interfaces,

and the regex not fit and keep looping to find the pattern,

so the system is crashed.

I re-code the API,

and let the model just empty return.