Fixed API return 500 error issue

Fixed 3 API return 500 error issue:

1. /api/avx/va/instance/ShowVARESTfulAPIConfig/_get_asso_list_data

Root Cause:

cli output is changed

Solution:

I changed the parse method.

2. /api/avx/va/instance/ShowVAPort/_get_list_data

Root Cause:

there is no VF Index for vport

Solution:

I skip vport for output

3. /api/avx/va/instance/ShowAttachedDisk/_get_asso_list_data

Root Cause:

The output of cli is changed, it added new field: "Cache type", so the API cannot parse correctly.

Solution:

Modify the parse method.