authok: add support for Smart Card related authtokens Reviewed-by: Jakub Hrozek <jhrozek@redhat.com>

utils: add sss_authtok_[gs]et_2fa Reviewed-by: Lukáš Slebodník <lslebodn@redhat.com>

Add leak check and command line option to test_authtok Reviewed-by: Lukáš Slebodník <lslebodn@redhat.com>

tests: convert all unit tests to cmocka 1.0 or later All tests now use the cmocka-1.0-compatible API. Reviewed-by: Lukáš Slebodník <lslebodn@redhat.com>

TESTS: Fix authtok test for zero length string. There is a test for sss_authtok_set where '\0' is used as argument data. '\0' is evaluated as zero and zero is treated as a null pointer. And there is another test for NULL pointer few lines before. Patch changes 3rd argument '\0' into properly cast zero length sting ""

util: Fix const cast failures when building with -Werror When building with -Werror 'make check' fails with many errors like: ../src/tests/cmocka/test_authtok.c: In function ‘test_sss_authtok_password’: ../src/tests/cmocka/test_authtok.c:98:48: error: cast discards ‘__attribute__((const))’ qualifier from pointer target type [-Werror=cast-qual] Make sss_authtok_set() @data argument const, and fix its documentation

cmocka unit test for authtok module added