Bug 19185: Add selenium tests for installation and onboarding process

Bug 19185: Add selenium tests for installation and onboarding process

== Test plan ==
1. Apply the patches (including bug 19821)
2. restart_all
3. prove -Mt::lib::Bootstrap t/db_dependent/selenium/00-installation.t
4. result: Config entry 'database_test' does not exist at
     /home/vagrant/kohaclone/t/lib/Bootstrap.pm line 18
5. Edit $KOHA_CONF, add a database_test entry identical to database
     You should have:
     <database>koha_kohadev</database>
     <database_test>koha_kohadev</database_test>
6. restart_all
7. prove -Mt::lib::Bootstrap t/db_dependent/selenium/00-installation.t
8. result: Entries 'database_test' and 'database' have the same value in your
     config at /home/vagrant/kohaclone/t/lib/Bootstrap.pm line 20.
9. Edit $KOHA_CONF, edit database_test with koha_test as DB name
10. restart_all
11. prove -Mt::lib::Bootstrap t/db_dependent/selenium/00-installation.t
12. result: Access denied for user 'koha_kohadev'@'localhost'
       to database 'koha_test'
13. Connect to the DBMS
14. Example for koha_testing_docker
      docker exec -it koha_db_1 bash
      mysql -u root --password=password
15. GRANT ALL PRIVILEGES ON `koha_test`.* TO 'koha_kohadev';
16. prove -Mt::lib::Bootstrap t/db_dependent/selenium/00-installation.t
17. result: All tests successful.

Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Victor Grousset/tuxayo <victor@tuxayo.net>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>