Tapdisk appends .stats to the stats filenames

Signed-off-by: Jon Ludlam <jonathan.ludlam@eu.citrix.com>
Register unix domain sockets per SM plugin

Signed-off-by: Jon Ludlam <jonathan.ludlam@eu.citrix.com>
Add some debugging to vhdSlave.

Signed-off-by: Jon Ludlam <jonathan.ludlam@eu.citrix.com>