[dhcp_relay] Remove skip dhcp_relay test when dhcp_server is enabled (#…

…16608)

What is the motivation for this PR?
This skip condition would take effect on all test cases under dhcp_relay folder, which would skip dhcpv6_relay tests too. But we don't want to skip it when dhcp_server is enabled.
And dhcpv4_relay test is only running in m0 and t0, which wouldn't enable dhcp_server

How did you do it?
Remove skip check

How did you verify/test it?
Run tests

tests/dhcp_relay/conftest.py

@@ -39,8 +39,6 @@ def pytest_addoption(parser):
 def check_dhcp_feature_status(duthost):
     feature_status_output = duthost.show_and_parse("show feature status")
     for feature in feature_status_output:
-        if feature["feature"] == "dhcp_server" and feature["state"] == "enabled":
-            pytest.skip("DHCPv4 relay is not supported when dhcp_server is enabled")
         if feature["feature"] == "dhcp_relay" and feature["state"] != "enabled":
             pytest.skip("dhcp_relay is not enabled")