[Openais] corosync - handle POLLNVAL in coroipcc

[Jan Friesse]

Acked by dct in BZ#582313.

Committed revision 2789.

Jan Friesse wrote:
> Releated to https://bugzilla.redhat.com/show_bug.cgi?id=582313
> 
> Old code in coroipcc doesn't handle POLLNVAL. It can happen, that some
> applications (for example fenced) will stuck forever.
> 
> Also poll result is now handled much more correctly.
> 
> Regards,
>   Honza
>