[moblab] Update unit test when for DUT ssh command

Fixed the code but forgot to update the unit test.

BUG=chromium:990418
TEST=local unit test run.

Change-Id: Iede4a76319b5e80c361328b5ed57b803d8e608ad
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/autotest/+/1735864
Reviewed-by: Keith Haddow <haddowk@chromium.org>
Commit-Queue: Keith Haddow <haddowk@chromium.org>
Tested-by: Keith Haddow <haddowk@chromium.org>
Auto-Submit: Keith Haddow <haddowk@chromium.org>
diff --git a/frontend/afe/moblab_rpc_interface_unittest.py b/frontend/afe/moblab_rpc_interface_unittest.py
index 28b62e8..1ba949b 100644
--- a/frontend/afe/moblab_rpc_interface_unittest.py
+++ b/frontend/afe/moblab_rpc_interface_unittest.py
@@ -706,7 +706,7 @@
     def testDutSshConnection(self):
         good_ip = '192.168.0.20'
         bad_ip = '192.168.0.30'
-        cmd = ('ssh -o ConnectTimeout=2 -o StrictHostKeyChecking=no '
+        cmd = ('ssh -o ConnectTimeout=3 -o StrictHostKeyChecking=no '
                 "root@%s 'timeout 2 cat /etc/lsb-release'")
 
         self.mox.StubOutWithMock(moblab_rpc_interface.subprocess,