Resolve TMSS-139

Closes TMSS-139

See merge request !96

TMSS-139: made LDAP vs Open-ID authentication configuration dynamic based on environment variables. This should give you a simple test-ldap server during testing, and allows Open-ID authentication in acceptance tests and/or production

TMSS-139: start test-ldap-server first, so django settings do not complain during database setup. Log autentication errors

TMSS-139: factored out the generation of test_data into the common tmss_test_environment_unittest_setup.py module. Fixed t_tmssapp_scheduling_functional and t_tmssapp_specification_functional.

TMSS-139: moved test-helper methods and test-data-creation methods into tmss_test_environment_unittest_setup.py for reusability

TMSS-139: renamed tmss_testldap to tmss_test_ldap, tmss_test_database_and_django_server to tmss_test_environment. Added test ldap server to test environment

TMSS-139: renamed tmss_testldap to tmss_test_ldap, tmss_test_database_and_django_server to tmss_test_environment. Added test ldap server to test environment

TMSS-139: renamed tmss_testldap to tmss_test_ldap, tmss_test_database_and_django_server to tmss_test_environment. Added test ldap server to test environment

TMSS-139: renamed tmss_testldap to tmss_test_ldap, tmss_test_database_and_django_server to tmss_test_environment. Added test ldap server to test environment

TMSS-139: enhanced the ldap test server routines into a reusable class that starts/stops the ldapserver in a with-context, ready to be used in unittests or from the commandline