Update outer UDP sport range to exclude port 53 (sonic-net#17570)

UDP sport 53 is a special port to be used in DNS and there is a rule in test server ovs switch
It would forward packet with UDP sport 53 to VM instead of to PTF port

Change-Id: I7c16425c8cceebd3a5cd6d9a4b20c4d93277c037

Author: echuawu

ansible/roles/test/files/ptftests/py3/hash_test.py

@@ -62,6 +62,12 @@ def check_required_params(self):
             if param not in self.test_params:
                 raise Exception("Missing required parameter {}".format(param))
 
+    def generate_random_sport(self):
+        while True:
+            port = random.randint(0, 65535)
+            if port != 53:
+                return port
+
     def setUp(self):
         '''
         @summary: Setup for the test
@@ -928,7 +934,7 @@ def check_ipv4_route(self, hash_key, src_port, dst_port_lists, outer_src_ip, out
         ) if hash_key == 'dst-ip' else self.dst_ip_interval.get_first_ip()
         sport = random.randint(0, 65535) if hash_key == 'src-port' else 1234
         dport = random.randint(0, 65535) if hash_key == 'dst-port' else 80
-        outer_sport = random.randint(0, 65535) if hash_key == 'outer-src-port' else 1234
+        outer_sport = self.generate_random_sport() if hash_key == 'outer-src-port' else 1234
 
         src_mac = (self.base_mac[:-5] + "%02x" % random.randint(0, 255) + ":" + "%02x" % random.randint(0, 255)) \
             if hash_key == 'src-mac' else self.base_mac
@@ -1046,7 +1052,7 @@ def check_ipv6_route(self, hash_key, src_port, dst_port_lists, outer_src_ip, out
             if hash_key == 'dst-mac' else self.base_mac
         router_mac = self.ptf_test_port_map[str(src_port)]['target_dest_mac']
 
-        outer_sport = random.randint(0, 65535) if hash_key == 'outer-src-port' else 1234
+        outer_sport = self.generate_random_sport() if hash_key == 'outer-src-port' else 1234
 
         if self.ipver == 'ipv6-ipv6':
             pkt_opts = {