Don't stop because we couldn't restart usb devices.

One of the build bots was failing to restart one device, but it still had four other devices online it could continue with.

BUG=

Review URL: https://codereview.chromium.org/59753003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@243292 0039d316-1c4b-4281-b951-d872f2087c98

build/android/buildbot/bb_device_status_check.py

@@ -302,9 +302,11 @@ def main():
     # Only restart usb if devices are missing
     if set(expected_devices) != set(devices):
       KillAllAdb()
-      if RestartUsb():
-        return 1
       retries = 5
+      if RestartUsb():
+        bb_annotations.PrintWarning()
+        print "USB reset stage failed, continuing anyway."
+        retries = 0
       while retries:
         time.sleep(1)
         devices = android_commands.GetAttachedDevices()