* test(grants): list virtual machines

issue #710

* feat(grants): allow remove all machines

issue #710

* fix(backend): cope with failure to resume

When stopping it tries to resume just in case. It crashes
if it is not paused

issue #739

* wip(grants): generic grants per machine

issue #749

* test(grants): shutdown clones

* feat(grants): shutdown clones

* fix(grants): ignore duplicated grant on startup

issue #739

* fix(backend): set default shutdown to 2 min

issue #739

* fix(shutdown): cleanup not necessary shutdowns

issue #739

* test(shutdown): process all requests

issue #739

* test(limits): test shuts down extra domain

issue #739

* wip(limits): only 1 running domain available

issue #739

* wip(grants): shutdown is now a long process

call to run all process

issue #739