NoShellIT: Increase the timeout to avoid failures

With 30 seconds timeout the test appears to be flaky.

Change-Id: Icc900ad6f108221d2e2dabb7e05c12d6772bd88b
diff --git a/javatests/com/google/gerrit/integration/ssh/NoShellIT.java b/javatests/com/google/gerrit/integration/ssh/NoShellIT.java
index ccaf085..2bbbf1a 100644
--- a/javatests/com/google/gerrit/integration/ssh/NoShellIT.java
+++ b/javatests/com/google/gerrit/integration/ssh/NoShellIT.java
@@ -41,7 +41,7 @@
 
   private String identityPath;
 
-  @Test(timeout = 30000)
+  @Test(timeout = 60000)
   public void verifyCommandsIsClosed() throws Exception {
     try (ServerContext ctx = startServer()) {
       setUpTestHarness(ctx);