[vnet_route_check] Align DB data parse logic with format used by swss…

[volodymyrsamotiy]

…common API

Signed-off-by: Volodymyr Samotiy volodymyrs@nvidia.com

What I did

• swsscommon API was changed in order to return data from DB as a tuple instead of dictionary.
• In some places vnet_route_check still was expecting data from DB in old format - as a dictionary.
• But now it is a tuple, so as a result vnet_route_check was failing with "KeyError" exeption.
• These changes fixed all the places in vnet_route_check script that used invalid data format.

As a result of above issue vnet_route_check.py script was failing with the following exception:

Traceback (most recent call last):
  File "/usr/local/bin/vnet_route_check.py", line 364, in <module>
    sys.exit(main())
  File "/usr/local/bin/vnet_route_check.py", line 335, in main
    app_db_vnet_routes = get_vnet_routes_from_app_db()
  File "/usr/local/bin/vnet_route_check.py", line 227, in get_vnet_routes_from_app_db
    intf = vnet_intfs[vnet_name][0]
KeyError: 'Vnet_2000'

How I did it

Fixed all the places in vnet_route_check script that used invalid data format: just converted data returned by swsscommon API from tuple to dictionary.

How to verify it

• Manually on the swicth
• Updated UT and verified it passed

Previous command output (if the output of a command-line utility has changed)

New command output (if the output of a command-line utility has changed)