[dhcp_relay] Restart bgp before dhcp_relay test

[yaqiangz]

Description of PR

Summary:
Fixes # (issue)

Type of change

• Bug fix
• Testbed and Framework(new/improvement)
• Test case(new/improvement)

Back port request

• 202012
• 202205
• 202305
• 202311
• 202405

Approach

What is the motivation for this PR?

We found that it's flaky that before dhcp_relay test, bgp is up but there is not routes received, which would cause dhcp_relay failed. Cannot manually reproduce this issue, suspect it's because testbed is messed up by other tests. Hence add restart bgp before dhcp_relay test

IPv4 Unicast Summary:
BGP router identifier 10.1.0.32, local AS number 65100 vrf-id 0
BGP table version 12
RIB entries 11, using 1408 bytes of memory
Peers 4, using 82368 KiB of memory
Peer groups 4, using 256 bytes of memory


Neighbhor      V     AS    MsgRcvd    MsgSent    TblVer    InQ    OutQ  Up/Down      State/PfxRcd  NeighborName
-----------  ---  -----  ---------  ---------  --------  -----  ------  ---------  --------------  --------------
10.0.0.57      4  64600         16         16        12      0       0  00:11:03                1  ARISTA01T1
10.0.0.59      4  64600         16         16        12      0       0  00:11:03                1  ARISTA02T1
10.0.0.61      4  64600         16         16        12      0       0  00:11:01                1  ARISTA03T1
10.0.0.63      4  64600         16         16        12      0       0  00:11:03                1  ARISTA04T1

How did you do it?

Restart bgp before dhcp_relay test

How did you verify/test it?

Run tests in t0

collected 7 items

dhcp_relay/test_dhcp_relay.py::test_interface_binding PASSED             [ 14%]
dhcp_relay/test_dhcp_relay.py::test_dhcp_relay_default PASSED            [ 28%]
dhcp_relay/test_dhcp_relay.py::test_dhcp_relay_after_link_flap PASSED    [ 42%]
dhcp_relay/test_dhcp_relay.py::test_dhcp_relay_start_with_uplinks_down PASSED [ 57%]
dhcp_relay/test_dhcp_relay.py::test_dhcp_relay_unicast_mac PASSED        [ 71%]
dhcp_relay/test_dhcp_relay.py::test_dhcp_relay_random_sport PASSED       [ 85%]
dhcp_relay/test_dhcp_relay.py::test_dhcp_relay_counter SKIPPED (skip...) [100%]INFO:root:Can not get Allure report URL. Please check logs

Any platform specific information?

Supported testbed topology if it's a new test case?

Documentation

[mssonicbld]

/azp run

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