This reverts commit fe985960, reversing
changes made to add95606.

This will help identify these tasks exists, since they are easier to
setup things for running all AR tests.

As done here d7fc97d3

in 'rubygems/package_task'

See #3892

Refactor Active Record test connection setup. Please see the RUNNING_UNIT_TESTS file for details, but essentially you can now configure things in test/config.yml. You can also run tests directly via the command line, e.g. ruby path/to/test.rb (no rake needed, uses default db connection from test/config.yml). This will help us fix the CI by enabling us to isolate the different Rails versions to different databases.

Have a separate test connection directory for sqlite3 in-memory so that the tests can be run without having to specifically rename the connection file (which then causes git to pick up the changes)

Signed-off-by: NJosé Valim <jose.valim@gmail.com>

Signed-off-by: NXavier Noria <fxn@hashref.com>

Signed-off-by: NJeremy Kemper <jeremy@bitsweat.net>