Improvements to update_package.sh

- update_package.sh
  - Add set -eu
  - Add -s flag to specify ssh_host to deploy to
  - No longer rely on OO_APP_USER env variable
  - Determine the application url from the deployed application,
    the -u flag will override this behavior, unless the application
    is oo-install.rhcloud.com
  - If deploying to oo-install.rhcloud.com set the URL to
    install.openshift.com whether -u is set or not.
  - Add some additional user output and add 5 second sleeps to
    allow a user to exit the script if the wrong host or url is
    detected.