[tests] set default node parameters (#6593)

This commit set default node parameters and remove unnecessary
parameters in topologies.
- router selection jitter to 1s
- panid to 0xface

tests/scripts/thread-cert/test_coaps.py

@@ -42,13 +42,10 @@ class TestCoaps(thread_cert.TestCase):
     TOPOLOGY = {
         LEADER: {
             'mode': 'rdn',
-            'panid': 0xface,
             'allowlist': [ROUTER]
         },
         ROUTER: {
             'mode': 'rdn',
-            'panid': 0xface,
-            'router_selection_jitter': 1,
             'allowlist': [LEADER]
         },
     }