FreeBSD/src 62e802c (r344489)sys/cam/ctl ctl.c ctl_io.h

Free some space in struct ctl_io_hdr for better use.

 - Collapse original_sc and serializing_sc fields into one, since they
are never used simultanously, we have only one local I/O and one remote.

 - Move remote_sglist and local_sglist fields into CTL_PRIV_BACKEND,
since they are used only on Originating SC in XFER mode, where requests
don't ever reach backends, so we can reuse backend's private storage.

MFC after:      2 weeks
Sponsored by:   iXsystems, Inc.
DeltaFile
+29-30sys/cam/ctl/ctl.c
+13-4sys/cam/ctl/ctl_io.h
+42-342 files

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