Another worthwhile split, needed one more public function.
* tools/virsh-nodedev.h: New file.
* tools/Makefile.am (virsh_SOURCES): Build it.
* tools/virsh-nodedev.c: Use new header.
* tools/virsh.c: Likewise.
(vshTreePrint): Export.
* tools/virsh.h (vshTreePrint): Declare.
Commands in node device group moved from virsh.c to virsh-nodedev.c,
* virsh.c: Remove commands in node device group.
* virsh-nodedev.c: New file, filled with commands in node device group
* po/POTFILES.in: Add virsh-nodedev.c
* cfg.mk: Skip to check config.h including for virsh-nodedev.c