Bug 18804: Skip selenium tests if Selenium::Remote::Driver is not installed

Bug 18804: Skip selenium tests if Selenium::Remote::Driver is not installed

We do not want these tests to fail if the module is not installed.
This module is not in the dependencies of Koha and it is good as it.
A developper who wants to use it will know what to do.
It is part of RM duties to make sure these tests pass

Signed-off-by: Lee Jamison <ldjamison@marywood.edu>
Signed-off-by: Lee Jamison <ldjamison@marywood.edu>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Mason James <mtj@kohaaloha.com>