* qemud/remote.c, qemud/remote_protocol.x, src/driver.h,
src/internal.h, src/libvirt.c, src/libvirt_sym.version,
src/qemu_driver.c, src/remote_internal.c, src/test.c:
Add a private interface so that libvirt.c coordination
functions can detect the availability of features in
underlying drivers, using the VIR_DRV_SUPPORTS_FEATURE
macro.
* qemud/remote.c, qemud/remote_generate_stubs.pl,
qemud/remote_dispatch_localvars.h,
qemud/remote_dispatch_proc_switch.h,
qemud/remote_dispatch_prototypes.h: Server side of
the remote patch, deals with call dispatch.