test: infamy: Add a timeout when starting each test if the DUTs is not reachable

This to cover if you run one test, but the DUTs are still booting.

test/infamy/env.py

@@ -6,7 +6,7 @@ import sys
 import random
 import inspect
 
-from . import neigh, netconf, restconf, ssh, tap, topology
+from . import neigh, netconf, restconf, ssh, tap, topology, util
 
 
 class NullEnv:
@@ -116,6 +116,13 @@ class Env(object):
     def get_password(self, node):
         return self.ptop.get_password(node)
 
+    def is_reachable(self, node, port):
+       ip = neigh.ll6ping(port)
+       if not ip:
+           return False
+
+       return util.is_reachable(ip, self, self.get_password(node))
+
     def attach(self, node, port="mgmt", protocol=None, test_reset=True, username = None, password = None):
         """Attach to node on port using protocol."""
 
@@ -126,6 +133,7 @@ class Env(object):
         else:
             mapping = None
 
+
         # Precedence:
         # 1. Caller specifies `protocol`
         # 2. User specifies `-t` when executing test
@@ -141,6 +149,9 @@ class Env(object):
         ctrl = self.ptop.get_ctrl()
         cport, _ = self.ptop.get_mgmt_link(ctrl, node)
 
+        print("Waiting for DUTs to become reachable...")
+        util.parallel(util.until(lambda: self.is_reachable(node, cport), 300))
+
         print(f"Probing {node} on port {cport} for IPv6LL mgmt address ...")
         mgmtip = neigh.ll6ping(cport)
         if not mgmtip: