usr.sbin: Automated cleanup of cdefs and other formatting

Apply the following automated changes to try to eliminate
no-longer-needed sys/cdefs.h includes as well as now-empty
blank lines in a row.

Remove /^#if.*\n#endif.*\n#include\s+<sys/cdefs.h>.*\n/
Remove /\n+#include\s+<sys/cdefs.h>.*\n+#if.*\n#endif.*\n+/
Remove /\n+#if.*\n#endif.*\n+/
Remove /^#if.*\n#endif.*\n/
Remove /\n+#include\s+<sys/cdefs.h>\n#include\s+<sys/types.h>/
Remove /\n+#include\s+<sys/cdefs.h>\n#include\s+<sys/param.h>/
Remove /\n+#include\s+<sys/cdefs.h>\n#include\s+<sys/capsicum.h>/

Sponsored by: Netflix

Remove $FreeBSD$: one-line .c pattern

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

spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD

The SPDX folks have obsoleted the BSD-2-Clause-FreeBSD identifier. Catch
up to that fact and revert to their recommended match of BSD-2-Clause.

Discussed with: pfg
MFC After: 3 days
Sponsored by: Netflix

various: general adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified many licenses so this was mostly a manual - error
prone - task.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.

No functional change intended.

Extract a set of pmcstat functions and interfaces to the new internal
library -- libpmcstat.

This includes PMC logging module, symbols lookup functions,
ELF parsing, process management, PMC attachment, etc.

This allows to reuse code while building new hwpmc(4)-based applications.

Also add pmcstat_symbol_search_by_name() function that allows to find
mapped IP range for a given function name.

Reviewed by: kib
Sponsored by: DARPA, AFRL
Differential Revision: https://reviews.freebsd.org/D12718

pmcstat(8); unsign some allocation variables and use reallocarray(3).

Use unsigned values in some internal variables that will be used during
allocation. The variables are used in reduced scope and have no chance of
becoming negative.

Provide bounds checking through reallocarray(3).

MFC after: 2 weeks

pmcstat: minor spelling fixes.

Mostly comments bur also a user-visible string.

MFC after: 2 weeks

More -Wmissing-variable-declarations fixes.

In addition to adding `static' where possible:

- bin/date: Move `retval' into extern.h to make it visible to date.c.
- bin/ed: Move globally used variables into ed.h.
- sbin/camcontrol: Move `verbose' into camcontrol.h and fix shadow warnings.
- usr.bin/calendar: Remove unneeded variables.
- usr.bin/chat: Make `line' local instead of global.
- usr.bin/elfdump: Comment out unneeded function.
- usr.bin/rlogin: Use _Noreturn instead of __dead2.
- usr.bin/tset: Pull `Ospeed' into extern.h.
- usr.sbin/mfiutil: Put global variables in mfiutil.h.
- usr.sbin/pkg: Remove unused `os_corres'.
- usr.sbin/quotaon, usr.sbin/repquota: Remove unused `qfname'.

- Support inlined location in calltree output.
In case of multiple level of inlining all the locations are flattened.
Require recent binutils/addr2line (head works or binutils from ports
with the right $PATH order).
- Multiple fixes in the calltree output (recursion case, ...)
- Fix the calltree top view that previously hide some shared nodes.

Tested with Kcachegrind(kdesdk4)/qcachegrind(head).

Sponsored by: NETASQ

Spelling fixes for usr.sbin/

Improve the chances of matching an outputted string with the line of code.

Remove duplicated header files

A new jail(8) with a configuration file, to replace the work currently done
by /etc/rc.d/jail.

When an asm location cannot be resolved to a function the cost
will be spread as small value and then filtered by the threshold.
As a first step solution display the number of event that cannot
be resolved as a valid function location.

MFC after: 1week

Fix the calltree top view that incorrectly filter out some nodes.

MFC after: 1 week

Fix warnings found by Coverity.

Found with: Coverity Prevent(tm)
MFC after: 1 month

MFC r207755:
Rework the calltree top view by critical callchain.
The percentage shown is the sum of the cost for the codepath.

Rework the calltree top view by critical callchain.
The percentage show is the sum of the cost for the codepath.

MFC after: 1 week

MFC r206994:
Apply threshold filter to root node in calltree view.

Apply threshold filter to root node in calltree view.

MFC after: 3days

MFC r206090:
Improve "top" header by:
- Display sample received per PMCs (or merged PMCs).
- Display percentage vs all samples

Improve "top" header by:
- Display sample received per PMCs (or merged PMCs).
- Display percentage vs all samples

MFC r205693:
Do not overflow the term in the case of multi-line display.

Do not overflow the term in the case of multi-line display.

MFC after: 3days

Create the altix project branch. The altix project will add support
for the SGI Altix 350 to FreeBSD/ia64. The hardware used for porting
is a two-module system, consisting of a base compute module and a
CPU expansion module. SGI's NUMAFlex architecture can be an excellent
platform to test CPU affinity and NUMA-aware features in FreeBSD.

MFC r204783:
Bug fixed:
- no display on serial terminal in top mode.
- display alignment for continuation string.
- correct invalid value used for display limit.

Bug fixed:
- no display on serial terminal in top mode.
- display alignment for continuation string.
- correct invalid value used for display limit.

MFC after: 3 days

MFC 203790:
- Reorganize code in 'plugin' to share log processing.
- Kcachegrind (calltree) support with assembly/source
code mapping and call count estimator (-F).
- Top mode for calltree and callgraph plugin (-T).

- Reorganize code in 'plugin' to share log processing.
- Kcachegrind (calltree) support with assembly/source
code mapping and call count estimator (-F).
- Top mode for calltree and callgraph plugin (-T).

MFC after: 1 month