[DPB] After breakout mode apply failed, interface switch to admin state down

[Hedgehog-Guru]

Description
After breakout mode apply failed, interface switch to admin state down.

Steps to reproduce the issue
Apply configuration like in #6630 (this configuration example lead to breakout fail)
Configure PortChannel:

config portchannel add PortChannel0001

Configure VLAN;

config vlan add 100

Add interface to PortChannel:

config port mem add PortChannel0001 Ethernet32

Assing VLAN to PortChannel:

config vlan mem add 100 PortChannel0001

Try to breakout the interface in the Portchannel:

config int breakout Ethernet32 2x50G

Describe the results you received
Configuration failed and interface goes to down state:

show int status
      Interface            Lanes    Speed    MTU    FEC    Alias             Vlan    Oper    Admin             Type    Asym PFC
---------------  ---------------  -------  -----  -----  -------  ---------------  ------  -------  ---------------  ----------
... output omited...
     Ethernet32      32,33,34,35     100G   9100    N/A    etp9a  PortChannel0001    down     down  QSFP28 or later         N/A

Describe the results you expected
Fail of interface breakout should not turn off the interface.

Output of show version

SONiC Software Version: SONiC.dpb_qa_image.0-23134a64
Distribution: Debian 10.7
Kernel: 4.19.0-9-2-amd64
Build commit: 23134a64
Build date: Fri Jan 15 08:52:11 UTC 2021
Built by: vadymh@r-build-sonic03

Platform: x86_64-mlnx_msn3800-r0
HwSKU: ACS-MSN3800
ASIC: mellanox
ASIC Count: 1
Serial Number: MT1937X00565
Uptime: 15:06:47 up 37 min,  1 user,  load average: 1.94, 2.34, 1.93

Docker images:
REPOSITORY                    TAG                       IMAGE ID            SIZE
docker-syncd-mlnx             dpb_qa_image.0-23134a64   72cd4f0bad6c        540MB
docker-syncd-mlnx             latest                    72cd4f0bad6c        540MB
docker-sflow                  dpb_qa_image.0-23134a64   070e94ad45b1        465MB
docker-sflow                  latest                    070e94ad45b1        465MB
docker-snmp                   dpb_qa_image.0-23134a64   4513d9bbede9        436MB
docker-snmp                   latest                    4513d9bbede9        436MB
docker-dhcp-relay             dpb_qa_image.0-23134a64   e9f74defdbed        402MB
docker-dhcp-relay             latest                    e9f74defdbed        402MB
docker-teamd                  dpb_qa_image.0-23134a64   4432208a6469        463MB
docker-teamd                  latest                    4432208a6469        463MB
docker-nat                    dpb_qa_image.0-23134a64   b0f25765961f        466MB
docker-nat                    latest                    b0f25765961f        466MB
docker-router-advertiser      dpb_qa_image.0-23134a64   875949f0ef94        395MB
docker-router-advertiser      latest                    875949f0ef94        395MB
docker-platform-monitor       dpb_qa_image.0-23134a64   77567d9ce67c        683MB
docker-platform-monitor       latest                    77567d9ce67c        683MB
docker-lldp                   dpb_qa_image.0-23134a64   9bba135a3864        435MB
docker-lldp                   latest                    9bba135a3864        435MB
docker-database               dpb_qa_image.0-23134a64   ae8be589a33c        394MB
docker-database               latest                    ae8be589a33c        394MB
docker-sonic-mgmt-framework   dpb_qa_image.0-23134a64   9f7fe89d1421        608MB
docker-sonic-mgmt-framework   latest                    9f7fe89d1421        608MB
docker-orchagent              dpb_qa_image.0-23134a64   5928b24d51e3        481MB
docker-orchagent              latest                    5928b24d51e3        481MB
docker-macsec                 dpb_qa_image.0-23134a64   b255f6b0ccf1        466MB
docker-macsec                 latest                    b255f6b0ccf1        466MB
docker-sonic-telemetry        dpb_qa_image.0-23134a64   4e502f1867fd        469MB
docker-sonic-telemetry        latest                    4e502f1867fd        469MB
docker-fpm-frr                dpb_qa_image.0-23134a64   684115a1f6cc        480MB
docker-fpm-frr                latest                    684115a1f6cc        480MB

sonic_dump_r-qa-sw-eth-2322_20210201_150722.tar.gz

[praveen-li]

sonic-net/sonic-utilities#1303 Solves this. Let me try to expedite the review.