Bug 12738: (regression tests) C4::Context should set keyword search as default for QueryParser

This patch introduces tests for the QueryParser PQF driver usage in Koha. Specifically its
initialization on C4::Context, and initial setup.

It also introduces a .pl script that is used to load C4::Context with different hash randomization
seeds on purpose, to verify the initialization result is deterministic and consistent between
runs.

To test:
  $ prove -v t/db_dependent/QueryParser.t

It should fail because different default_search_class is set on each run, and it is not often the
one we expect.

Sponsored-by: Universidad Nacional de Cordoba
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>
Bug 12738: C4::Context should set 'keyword' as the default search class

On a Perl 5.18 environment (e.g. Ubuntu 14.04 LTS):

To reproduce:
- Have UseQueryParser == "Don't try"
- Perform a search typing just a word that would have many matches on your Zebra db.
- Take note of the search results count.
- Make sure you have the queryparser.yaml file in your config dir.
- Set UseQueryParser == "Try"
- Perform the same search a couple of times
=> FAIL: Notice that the search results count differs from one run to the other.
- Run the regression tests
  $ prove -v t/db_dependent/QueryParser.t
=> FAIL: tests fail

To test:
- Apply the patch
- Run tests
  $ prove -v t/db_dependent/QueryParser.t
=> SUCCESS: tests pass
- Repeat the steps 'To reproduce'
=> SUCCESS: Search results count is deterministic :-D
- Sign off :-D

Sponsored-by: Universidad Nacional de Cordoba
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
Now search with QueryParser always returns the correct number of
results on a system with the newer Perl version.
Passes all tests and QA script.

Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>
Bug 12647: PQF QueryParser driver and unit tests fixes

Due to Perl 5.18, QueryParser the default search class is no longer
'keyword' (see bug 12738), and needs to be set manually. This patch
adds a line that does that. The problem that gets fixed is with test
'super simple keyword query'.

The rest of the non-deterministically failing tests are due to the same
problem, keys returning differently sorted keys from hashes.

So this patch sorts keys in the step that concatenates attributes when building
the PQF queries (and tests get adjusted to match the now deterministic result).

I did that (sorting there) under Jared's recommendation. Hopefuly he will step
in and comment/fix any mistake I made. My main concern was a possible loss
in performance. That we agreed it is almost void, because of the tiny size
of the hash.

Sponsored-by: Universidad Nacional de Cordoba
Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>
Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
All tests are passing now again :)

Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>