Extend CALessBase::installer_server to accept extra_args
Allow callers to pass abitrary extra arguments to the installer.
This is useful when using a CALess installation in order to
speed up tests that require a full install but do not require
a full PKI.
Reviewed-By: Rob Crittenden <firstname.lastname@example.org>
Reviewed-By: Alexander Bokovoy <email@example.com>
Reviewed-By: Christian Heimes <firstname.lastname@example.org>