CPU usage was calculated without taking SMP VM into account.

With the permission of Romain Degez, CTO of Smartjog.

Signed-off-by: Sébastien Luttringer <sebastien.luttringer@smartjog.com>

Moved to cc-common

sending events on removed domains or sending removed event too late.

Sometimes, libvirt tells us too late that a domain has been removed.

Harmless renaming.

When VM is not started, vnc port value is -1 in the libvirt domain XML config.

Some tags were returning None because of bad decorator.

Try to connect to libvirt while no exception is thrown.

Clean global variable for libvirt connection.

Create/Start/Stop/Destroy/Undefine/Export/Suspend/Resume.