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>
Which customization do you have in mind? Because so far I had no problems running inspekt/TravisCI and all findings were always bugs.

I use inspekt every time I review pull requests so breaking compatibility with it is not an option for me.