Bug 22048: Use set_password in tests

Bug 22048: Use set_password in tests

To test:
- Apply this patch
- Run:
  $ kshell
 k$ prove t/db_dependent/Auth.t \
          t/db_dependent/Koha/Patrons.t \
          t/db_dependent/Search/History.t \
          t/db_dependent/selenium/authentication.t \
          t/db_dependent/selenium/regressions.t
=> SUCCESS: Tests pass!
- Sign off :-D

Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Josef Moravec <josef.moravec@gmail.com>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>