[Subport] Add the parent admin status to the display of the sub-interface status

[irene-pan1202]

What I did

The admin status of the IP interface on sub port will also consider the admin status of its parent interface.
Shutdown parent interface, the admin status of the sub-port will be down (show ip interface).
But config_db and app_db are still admin up (show subinterfaces status).

root@sonic:~# config interface shutdown  Ethernet8
root@sonic:~# show ip interface
Interface        Master    IPv4 address/mask    Pri/Sec    Admin/Oper    BGP Neighbor    Neighbor IP
---------------  --------  -------------------  ---------  ------------  --------------  -------------
Ethernet8.10               192.169.1.1/24       Primary    down/down     N/A             N/A
Loopback0                  10.1.0.32/32         Primary    up/up         N/A             N/A
PortChannel0001            10.0.0.56/31         Primary    up/up         ARISTA01T1      10.0.0.57
PortChannel0002            10.0.0.58/31         Primary    up/up         ARISTA02T1      10.0.0.59
PortChannel0003            10.0.0.60/31         Primary    up/up         ARISTA03T1      10.0.0.61
PortChannel0004            10.0.0.62/31         Primary    up/up         ARISTA04T1      10.0.0.63
Vlan1000                   192.168.0.1/21       Primary    up/up         N/A             N/A
docker0                    240.127.1.1/24       Primary    up/down       N/A             N/A
eth0                       10.250.0.178/16      Primary    up/up         N/A             N/A
lo                         127.0.0.1/8          Primary    up/up         N/A             N/A
root@sonic:~# show subinterfaces status
  Sub port interface    Speed    MTU    Vlan    Admin                  Type
--------------------  -------  -----  ------  -------  --------------------
        Ethernet8.10     100G   9100      10       up  802.1q-encapsulation
root@sonic:~#

How I did it

Add the parent admin status to the display of the sub-interface status

How to verify it

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)

root@sonic:~$ show subinterfaces status
  Sub port interface    Speed    MTU    Vlan    Admin    Parent_Admin                  Type
--------------------  -------  -----  ------  -------  --------------  --------------------
        Ethernet8.10     100G   9100      10       up            down  802.1q-encapsulation
     PortChannel1.20     100G   9100      20       up            down  802.1q-encapsulation

[ghost]

All CLA requirements met.

[prsunny]

@wendani , could you please review?

[wendani]

How is sub port interface oper status defined here? SAI does not have this attribute for sub port interface.

[peter-yu]

'show ip interface' get the admin & oper status reported by the kernel.
(according to the code: sonic-utilities/show/main.py: get_if_admin_state and get_if_oper_state)