libsa: Remove redundant sys/cdefs.h

Sponsored by: Netflix

Remove $FreeBSD$: one-line .c pattern

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

stand: Use c99 structure initialization for pkgfs_fsops

Sponsored by: Netflix

pkgfs_open: follow symlinks

Caller is not interested in symlinks follow them.
Throw an error if too many links encountered.

Reviewed by: stevek
Sponsored by: Juniper Networks
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Change-Id: I4ef92ff256f503c620dc5bba79ed93b32cb2330d

zalloc_malloc:Free hexdump preceeding buffer when we detect overflow

Move hexdump from stand/common/misc.c to stand/libsa/hexdump.c
(svn cp)
Disable use of pager - causes linking issue for boot1
can be re-enabled by defining HEXDUMP_PAGER.

Reviewed by: stevek, imp
MFC after: 1 week
Sponsored by: Juniper Networks
Differential Revision: https://reviews.freebsd.org/D26235

[libsa] Fix typecast of pointer for st_dev

This code was trying to use a pointer value for st_dev, which is definitely
not a pointer. Instead, cast to uintptr_t so it becomes a non-pointer value
before casting it.

Tested: mips-gcc cross compile, mips32 build

Improve interaction of vectx and tftp

On slow platforms, it helps to spread the hashing load
over time so that tftp does not timeout.

Also, some .4th files are too big to fit in cache of pkgfs,
so increase cache size and ensure fully populated.

Reviewed by: stevek
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D24287

Fix pkgfs stat so it satisfies libsecureboot

We need a valid st_dev, st_ino and st_mtime
to correctly track which files have been verified
and to update our notion of time.

ve_utc_set(): ignore utc if it would jump our current time
by more than VE_UTC_MAX_JUMP (20 years).

Allow testing of install command via userboot.
Need to fix its stat implementation too.

bhyveload also needs stat fixed - due to change to userboot.h

Call ve_error_get() from vectx_close() when hash is wrong.

Track the names of files we have hashed into pcr

For the purposes of measured boot, it is important
to be able to reproduce the hash reflected in
loader.ve.pcr
so loader.ve.hashed provides a list of names in the order they
were added.

Reviewed by: imp
MFC after: 1 week
Sponsored by: Juniper Networks
Differential Revision: https://reviews.freebsd.org//D24027

pkgfs_init: Initialize pkg

new_package may not set *pp if it errors out, leaving pkg uninitialized.

Reported by: GCC

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

Sponsored by: Netflix