ICMP echo: example test were failing due to regex not matching TTL

examples/protocols/icmp_echo/example_test.py

@@ -16,7 +16,7 @@ def test_examples_icmp_echo(env, extra_data):
     ip = dut.expect(re.compile(r'64 bytes from ({}) icmp_seq=1 ttl=\d+ time=\d+ ms'.format(ip_re)))[0]
 
     # expect at least one more (there could be lost packets)
-    dut.expect(re.compile(r'64 bytes from {} icmp_seq=[2-5] ttl=49 time='.format(ip)))
+    dut.expect(re.compile(r'64 bytes from {} icmp_seq=[2-5] ttl=\d+ time='.format(ip)))
 
     dut.expect(re.compile(r'5 packets transmitted, [2-5] received, \d{1,3}% packet loss'))
     dut.write('')