inconsistent kernel route entry versus the bgp route entry

[lguohan]

Description

Steps to reproduce the issue:
1.
2.
3.

Describe the results you received:

In some kvm test run, the kernel route entry is in consistent bgp route entry.

https://sonic-jenkins.westus2.cloudapp.azure.com/job/common/job/sonic-mgmt-testing/job/sonic-mgmt-pr/11/artifact/sonic-mgmt/tests/logs/1vlan/bgp/test_bgp_fact.log/*view*/

In above log, there is no 7 routes in the kernel, but bgp shows 6400 routes.

INFO     common.plugins.sanity_check.checks:checks.py:179 cmd='ip route | wc -l', output:
[
    "7"
]

INFO     common.plugins.sanity_check.checks:checks.py:179 cmd='show ip bgp summary', output:
[
    "", 
    "IPv4 Unicast Summary:", 
    "BGP router identifier 10.1.0.32, local AS number 65100 vrf-id 0", 
    "BGP table version 2", 
    "RIB entries 12807, using 2301 KiB of memory", 
    "Peers 4, using 82 KiB of memory", 
    "Peer groups 6, using 384 bytes of memory", 
    "", 
    "Neighbor        V         AS MsgRcvd MsgSent   TblVer  InQ OutQ  Up/Down State/PfxRcd\tNeighborName", 
    "10.0.0.57       4      64600    9779     179        0    0    0 00:00:43         6400\tARISTA01T1", 
    "10.0.0.59       4      64600    3441     187        0    0    0 00:09:11         6400\tARISTA02T1", 
    "10.0.0.61       4      64600    3475     187        0    0    0 00:09:11         6400\tARISTA03T1", 
    "10.0.0.63       4      64600    3438     187        0    0    0 00:09:11         6400\tARISTA04T1", 
    "", 
    "Total number of neighbors 4"

This is mostly likely a sonic image issue, but I do not know how to repro.

But I do see multiple instances such error in recent kvm test results.

Describe the results you expected:

Additional information you deem important:

**Output of `show version`:**

```
(paste your output here)
```

**Attach debug file `sudo generate_dump`:**

```
(paste your output here)
```

[lguohan]

duplicated as #5026