Changes for VOQ single-dut multi-asic (sonic-net#17836)

Split the original PR Reg: Changes of VOQ Single Dut Multi asic sonic-net#17130 into individual PRs for each test.
This is an enhancement to support VOQ Single DUT Multi-ASIC setup for T2 topo.
Type of change
 Bug fix
 Testbed and Framework(new/improvement)
 New Test case
 Skipped for non-supported platforms
 Test case improvement
Back port request
 202012
 202205
 202305
 202311
 202405
 202411
Approach
What is the motivation for this PR?
New testbed modification of VOQ Single DUT and multi-asic.
How did you do it?
If T2 topo, decide based on the number of Duts.
How did you verify/test it?
Any platform specific information?
Supported testbed topology if it's a new test case?
T2 VOQ Single Dut Multi ASIC

Signed-off-by: Guy Shemesh <[email protected]>

Author: sanjair-git

tests/everflow/everflow_test_utilities.py

@@ -355,8 +355,11 @@ def setup_info(duthosts, rand_one_dut_hostname, tbinfo, request, topo_scenario):
     duthost = None
     topo = tbinfo['topo']['name']
     if 't2' in topo:
-        pytest_assert(len(duthosts) > 1, "Test must run on whole chassis")
-        downstream_duthost, upstream_duthost = get_t2_duthost(duthosts, tbinfo)
+        if len(duthosts) == 1:
+            downstream_duthost = upstream_duthost = duthost = duthosts[rand_one_dut_hostname]
+        else:
+            pytest_assert(len(duthosts) > 2, "Test must run on whole chassis")
+            downstream_duthost, upstream_duthost = get_t2_duthost(duthosts, tbinfo)
     else:
         downstream_duthost = upstream_duthost = duthost = duthosts[rand_one_dut_hostname]