Fix snmp_facts for creating IPv6 UdpTransportTarget (sonic-net#21272)

In PR sonic-net#21045, I made mistakes while resolving the conflicts with sonic-net#20292. Some code added in sonic-net#20292 was accidentally reverted.

This change is to add back the code introduced in sonic-net#20292 for creating SNMP UdpTransportTarget. Then the snmp_facts module will work with IPv6 only scenario again.

Signed-off-by: Xin Wang <xiwang5@microsoft.com>

Author: wangxin

ansible/library/snmp_facts.py

@@ -952,7 +952,7 @@ def main_legacy(module):
 
     errorIndication, errorStatus, errorIndex, varTable = cmdGen.nextCmd(
         snmp_auth,
-        cmdgen.UdpTransportTarget((m_args['host'], 161), timeout=m_args['timeout']),
+        _create_transport_target(m_args['host'], 161, m_args['timeout']),
         cmdgen.MibVariable(p.csqIfQosGroupStatsValue,),
         lookupMib=False,
     )
@@ -991,7 +991,7 @@ def main_legacy(module):
 
     errorIndication, errorStatus, errorIndex, varTable = cmdGen.nextCmd(
         snmp_auth,
-        cmdgen.UdpTransportTarget((m_args['host'], 161), timeout=m_args['timeout']),
+        _create_transport_target(m_args['host'], 161, m_args['timeout']),
         cmdgen.MibVariable(p.ipCidrRouteDest,),
         cmdgen.MibVariable(p.ipCidrRouteStatus,),
         lookupMib=False,
@@ -1070,7 +1070,7 @@ def main_legacy(module):
 
         errorIndication, errorStatus, errorIndex, varTable = cmdGen.nextCmd(
             snmp_auth,
-            cmdgen.UdpTransportTarget((m_args['host'], 161), timeout=m_args['timeout']),
+            _create_transport_target(m_args['host'], 161, m_args['timeout']),
             cmdgen.MibVariable(p.dot1qTpFdbPort,),
             lookupMib=False,
         )