subtests.docker_daemon: Adds tests for connection with certificate.

Tests generates certificates and sign them up with created CA certificate,
then test connect server and client part with different configurations.

Signed-off-by: Jiří Župka <jzupka@redhat.com>
oh, nvm, I guess it is.  Maybe it would help to give it a more descriptive name than ``bash1``, how about ``ddaemon``?