libsa: Remove redundant sys/cdefs.h

Sponsored by: Netflix

stand: Remove ancient SCCS tags.

Remove ancient SCCS tags from the tree, automated scripting, with two
minor fixup to keep things compiling. All the common forms in the tree
were removed with a perl

stand: Remove ancient SCCS tags.

Remove ancient SCCS tags from the tree, automated scripting, with two
minor fixup to keep things compiling. All the common forms in the tree
were removed with a perl script.

Sponsored by: Netflix

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Remove $FreeBSD$: one-line .c pattern

Remove /^[\s*]*__FBSDID\("\$FreeBSD\$"\);?\s*\n/

loader: open file list should be dynamic

Summary:
Open file list is currently created as statically allocated array (64 items).
Once this array is filled up, loader will not be able to operate with

loader: open file list should be dynamic

Summary:
Open file list is currently created as statically allocated array (64 items).
Once this array is filled up, loader will not be able to operate with files.
In most cases, this mechanism is good enough, but the problem appears, when
we have many disks with zfs pool(s). In current loader implementation, all
discovered zfs pool configurations are kept in memory and disk devices open -
consuming the open file array. Rewrite the open file mechanism to use
dynamically allocated list.

Reviewed by: imp
MFC after: 2 weeks
Differential Revision: https://reviews.freebsd.org/D31364

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libsa: remobe unneeded check before free()

free() is checking for NULL, remove duplicate check.

libsa: cstyle cleanup for open/close/read/write sources

Merge ^/head r325663 through r325841.

Move sys/boot to stand. Fix all references to new location

Sponsored by: Netflix