Add environment for testing canonical-certification-server

Signed-off-by: Zygmunt Krynicki <zygmunt.krynicki@canonical.com>
Rename cdts to canonical-driver-test-suite

Signed-off-by: Zygmunt Krynicki <zygmunt.krynicki@canonical.com>
Add environment for headless plainbox testings
Add environment for headless checkbox-ng testing