jailhouse: Add support for upcoming pyjailhouse module

In next, we already have the factored-out pyjailhouse Python module, and
we need to install and packages that in order to use the version. The
additional dependencies cause no problem for the 0.9.1 release, so we
can already include them for both.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>