devnet: increase eth tests timeout

60s is not enough on my machine, causing deployment to fail.

Change-Id: Iee6d81ab8251d466a6429ea0555306a50deba34b

devnet/eth-devnet.yaml

@@ -54,7 +54,7 @@ spec:
             - "npm run migrate && npx truffle exec scripts/deploy_test_token.js && nc -l -p 2000 && sleep infinity"
           startupProbe:
             periodSeconds: 1
-            failureThreshold: 60
+            failureThreshold: 300
             tcpSocket:
               port: 2000
         - name: mine