IPC: improve shm performance by timing out earlier on poll()
IPC: improve shm performance by timing out earlier on poll()

My receint change adding in a call to recv_ready(, 10) was
really slowing down the shm performance.
So now I am rather retrying which doesn't slow it down
and also passes "make check".

Signed-off-by: Angus Salkeld <86b65304d27d8de73dd7d624c33df7e088f8d94b@redhat.com>

ClusterLabs/libqb,ClusterLabs/libqb,kgaillot/libqb,gao-yan/libqb,gao-yan/libqb,davidvossel/libqb,davidvossel/libqb,rubenk/libqb,kgaillot/libqb,kgaillot/libqb,rubenk/libqb,ClusterLabs/libqb