test_ca: add empty index.txt.attr file Although is does not harm because 'openssl ca' creates the index.tx.tattr file with a suitable content automatically this patch adds the file to the test_CA directory to silence a message like: Can't open ./index.txt.attr for reading, No such file or directory 139867607979840:error:02001002:system library:fopen:No such file or directory:crypto/bio/bss_file.c:74:fopen('./index.txt.attr','r') 139867607979840:error:2006D080:BIO routines:BIO_new_file:no such file:crypto/bio/bss_file.c:81: which is show by recent versions of OpenSSL. Related to https://pagure.io/SSSD/sssd/issue/3436 Reviewed-by: Fabiano Fidêncio <fidencio@redhat.com>

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>