[libvirt] [PATCH v2 4/4] Implement virDomainSendProcessSignal for LXC driver

[Eric Blake]

> Implement the new API for sending signals to processes in a guest
> for the LXC driver. Only support sending signals to the init
> process for now, because
> 
>  - The kernel does not appear to expose the mapping between
>    container PID numbers and host PID numbers anywhere in the
>    host OS namespace
>  - There is no race-free validate whether a host PID corresponds

s/validate/way to validate/

ACK