Add timeout in dashboard_test
Add timeout in dashboard_test

- Shutting down the dashboard sometimes hangs indefinitely. This
  way it
  will not wait forever and we can let ginkgo kill it if
  it hangs

  [#116730577]

Signed-off-by: Aditya Anchuri <fec81add3ed0c5a00986a42aa9b6fb1400567b77@pivotal.io>

cloudfoundry-incubator/cf-mysql-acceptance-tests,cloudfoundry-incubator/cf-mysql-acceptance-tests,cloudfoundry-incubator/cf-mysql-acceptance-tests,cloudfoundry-incubator/cf-mysql-acceptance-tests