Pull up the following revisions(s) (requested by oster in ticket #1933):
	sys/dev/raidframe/raidframevar.h:	revision 1.17
	sys/dev/raidframe/rf_netbsdkintf.c:	revision 1.316
	sys/dev/raidframe/rf_reconstruct.c:	revision 1.121 via patch

Fix a long-standing bug related to rebooting while a reconstruct-to-spare
is underway but not yet complete. Fixes PR kern/49244.