Update the tests in test_keywords_dialog module.

* Use tests data in InaSAFE source for these tests:
        * test_add_keyword_when_press_ok_button
        * test_get_value_for_key
        * test_load_state_from_keywords
        * test_on_dsb_female_ratio_default_value_changed
        * test_on_rad_postprocessing_toggled
        * test_remove_item_by_value
        * test_check_aggregation
* Update clone_shp_layer function
* Remove clone_padang_layer function
* Update tests in test_gis to not use clone_padang_layer function

Signed-off-by: Akbar Gumbira <akbargumbira@gmail.com>