Extend config reload wait time for static route tests (#3749)

*The arp_update script updates unresolved neighbors every 300 seconds. As the default config reload wait time is 120 seconds, the arp_update script may not finish the neighbor resolution before the config reload wait time and cause the static route test to fail. This PR aims to fix the timing issue for static route tests.
*Fix: Extend config reload wait time for static route tests

Author: shi-su

tests/route/test_static_route.py

@@ -137,7 +137,7 @@ def run_static_route_test(duthost, ptfadapter, ptfhost, tbinfo, prefix, nexthop_
         # Config save and reload if specified
         if config_reload_test:
             duthost.shell('config save -y')
-            config_reload(duthost)
+            config_reload(duthost, wait=350)
             generate_and_verify_traffic(duthost, ptfadapter, tbinfo, ip_dst, nexthop_devs, ipv6=ipv6)
             check_route_redistribution(duthost, prefix, ipv6)