TESTS: simple CA to generate certificates for test To avoid issue with certificate lifetimes a simple OpenSSL based CA is used to generate certificates for tests. To make management easy all related data is kept in src/tests/test_CA. Since some header files will be generated the generation of the needed files is added to BUILT_SOURCES as other generated code. Related to https://pagure.io/SSSD/sssd/issue/3436 Reviewed-by: Lukáš Slebodník <lslebodn@redhat.com>