some tests have to be refactored

[BenjaminQuandt]

While adding travis ci I had to disable some tests.

I got the following errors:

• RuntimeException: The requested database connection named "Default" has not been configured.

• tx_mkforms_tests_action_FormBaseTest

• tx_mkforms_tests_api_mainrendererTest

• tx_mkforms_tests_api_tx_ameosformidableTest

• tx_mkforms_tests_util_FormBaseTest

• tx_mkforms_tests_validator_timetracking_MainTest

• Creating default object from empty value

• tx_mkforms_tests_util_FormBaseAjaxTest

• tx_mkforms_tests_util_FormBaseTest

• tx_mkforms_tests_util_FormFillTest

• tx_mkforms_tests_util_TemplatesTest

• Exception: No extension key found for classname: Tx_Phpunit_Framework

• tx_mkforms_tests_api_maindatahandlerTest

• error from tx_mkforms_tests_Util
  --> call_user_func_array() expects parameter 1 to be a valid callback, first array member is not a valid class name or object.
  --> Creating default object from empty value

• tx_mkforms_tests_api_mainrenderletTest

• tx_mkforms_tests_api_mainvalidatorTest