Wrap long lines

Approved by:	bapt
MFC after:	2 days
Fix a couple of bugs in the fasttrap emulation of a "push %rbp" instruction:
the code was trying to save the stack pointer rather than the frame pointer,
and the arguments to copyout(9) were reversed, so nothing ended up being
saved on the stack. This would cause process crashes when the pid provider
was being used to instrument calls of a function starting with this
instruction.

Reported by:	symbolics@gmx.com
Tested by:	symbolics@gmx.com (earlier version)
MFC after:	2 weeks
Fix build after r257111 by including headers with definition of pmap_kextract().
Add support for reading configuration files from /etc/pkg.
For now only /etc/pkg/FreeBSD.conf is supported. Its style is:

Repo: {
   URL: "...",
   MIRROR_TYPE: "...",
   ...
}

The configuration will be read from /usr/local/etc/pkg.conf if exists,
otherwise /etc/pkg/FreeBSD.conf

Approved by:	bapt
MFC after: 	2 days
Be verbose and tell where pkg(8) is being bootstrapped from.

Approved by:	bapt
MFC after:	2 days
Support checking signature for pkg bootstrap.

If the pkg.conf is configured with SIGNATURE_TYPE: FINGERPRINTS,
and FINGERPRINTS: /etc/keys/pkg then a pkg.sig file is fetched along
with pkg.txz. The signature contains the signature provided by the
signing server, and the public key. The .sig is the exact output
from the signing server in the following format:

  SIGNATURE
  <openssl signed>
  CERT
  <rsa public key>
  END

The signature is verified with the following logic:

 - If the .sig file is missing, it fails.
 - If the .sig doesn't validate, it fails.
 - If the public key in the .sig is not in the known trusted fingerprints,
   it fails.
 - If the public key is in the revoked key list, it fails.

Approved by:	bapt
MFC after:	2 days
Discussed by:	bapt with des, jonathan, gavin
Tell which fingerprint pkg is being validated against.

Approved by:	bapt
MFC after:	2 days
Add support to check the signature of a local pkg.txz file being
added with "pkg add". If the pkg.conf is configured to check for
signature, then the pkg.txz.sig file will be expected and validated
per r257147

Approved by:	bapt
MFC after:	2 days
Add infrastructure for installing pkg(8) keys into /etc/keys/pkg and add
the current test key that packages will be signed with until 10.0-RELEASE.

Approved by:	bapt
Discussed by:	bapt with des
MFC after:	2 days
Document /var/cache/pkg into hier(7) which pkg(8) uses.

Approved by:	bapt
MFC after:	2 days
Do some cleanup of the SDT code. In particular,

* Remove the unused sdt cdev.
* Don't bother keeping a list of probes in struct sdt_prov; it's not needed.
* Invoke sdt_load and sdt_unload from the module handler instead of
  registering separate SYSINITs.
* Keep to within 80 columns.
* Check for errors from dtrace_unregister().
Merging local and remote bitmaps must be protected by hr_amp lock.

This is believed to fix hastd crashes, which might occur during
synchronization, triggered by the failed assertion:

 Assertion failed: (amp->am_memtab[ext] > 0),
 function activemap_write_complete, file activemap.c, line 351.

MFC after:	1 week
Make hastctl list command output current queue sizes.

Reviewed by:	pjd
MFC after:	1 month
machine/pmap.h is included by vm/pmap.h, so is redundant here. Thanks to
Alan Cox for pointing this out.
Link in libcrypto as well to fix build in some cases.

Approved by:	bapt
MFC after:	2 days
Reported by:	many
Disable fingerprint checking for now as the pkg repository mirrors will
not receive the signature until later this week.

Approved by:	bapt
Queisce warnings for gperf -Wlogical-op-parentheses with parens to
explicitly define the logic
Add pmap_mapdev_attr() and pmap_kenter_attr() interfaces. pmap_set_memattr()
is slightly more complicated and is left unimplemented for now. Also
prevent pmap_mapdev() from mapping over the kernel and KVA regions if
devices happen to have high physical addresses.

MFC after:	2 weeks
The old trap.h (then trap_aim.h) actually had trap ID codes for Book-E CPUs.
Use it universally. Book-E traps may also need revisiting due to the
introduction of fixed-offset traps and the deprecation of IVORs in POWER
ISA 2.06, but that's very much an issue for another day.
Add missing /etc/pkg to BSD.root.dist

Approved by:	bapt
MFC after:	2 days
X-MFC-With:	r257145