- Copy stable/10 (r259064) to releng/10.0 as part of the
10.0-RELEASE cycle.
- Update __FreeBSD_version [1]
- Set branch name to -RC1

[1] 10.0-CURRENT __FreeBSD_version value ended at '55', so
start releng/10.0 at '100' so the branch is started with
a value ending in zero.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Sync pf.os with OpenBSD:

add a handful of linux signatures from p0fv2 and some other
signatures from observation.

MFC after: 2 weeks

Sync pf.os with OpenBSD:

- Update OpenBSD fingerprints through OpenBSD 4.9
- Fix typos.

Obtained from: OpenBSD
MFC after: 2 weeks
Approved by: re (kib)

Synchronize pf.os with OpenBSD.

Obtained from: OpenBSD
MFC After: 3 days
Approved by: mlaier (maintainer)

Update the passive OS fingerprint database from OpenBSD.

Obtained from: lcamtuf.coredump.cx (via OpenBSD)

Removed whitespace at BOF, EOL & EOF.

Link pf to the build and install:
This adds the former ports registered groups: proxy and authpf as well as
the proxy user. Make sure to run mergemaster -p in oder to complete make
installworld without errors.

This also provides the passive OS fingerprints from OpenBSD (pf.os) and an
example pf.conf.

For those who want to go without pf; it provides a NO_PF knob to make.conf.

__FreeBSD_version will be bumped soon to reflect this and to be able to
change ports accordingly.

Approved by: bms(mentor)