* qemud/conf.[ch]: significantly re-factor qemudLoadConfigXML()
so that "parse the XML", "assign the def to a VM" and
"save the XML" operations are in separate functions.
Add qemudRemoveInactiveVM() and qemudRemoveInactiveNetwork().
Report errors when loading config files at startup. Check
that a domain/network's name matches the config filename.
* qemud/driver.c: update the Create() and Define() functions
to explicitly parse/assign/save. Also, fix bug where if
Create() failed, we would free the VM without removing it
from the inactive list.
* qemud/qemud.c: use qemudRemoveInactiveVM/Network()
* qemud/conf.[ch]: implement parsing and saving network
configs.
* qemud/driver.c: flesh out the stubs
* qemud/internal.h: add networks list etc. to
struct qemud_server
* qemud/qemud.c: add qemudStartNetworkDaemon() and
qemudShutdownNetworkDaemon() stubs.
