struct sockaddr_storage is guaranteed to be large enough, no need to check
the size.
OK kn, deraadt

Cope with the iscsid changes. Makes the msg handling a lot easier.
This also introduces some stuff that is work in progress.

Add iscsictl bits to show the vscsi stats.

Import iscsictl -- the control tool for iscsid.
Currently only discovery and reload work.
OK dlg@, matthew@, deraadt@