libsys: relocate implementations and manpages

Remove core system call implementations and documentation to lib/libsys
and lib/libsys/<arch> from lib/libc/sys and lib/libc/<arch>/<sys>.
Update paths

libsys: relocate implementations and manpages

Remove core system call implementations and documentation to lib/libsys
and lib/libsys/<arch> from lib/libc/sys and lib/libc/<arch>/<sys>.
Update paths to allow libc to find them in their new home.

Reviewed by: kib, emaste, imp
Pull Request: https://github.com/freebsd/freebsd-src/pull/908

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Remove $FreeBSD$: two-line nroff pattern

Remove /^\.\\"\n\.\\"\s*\$FreeBSD\$$\n/

Remove "All Rights Reserved" from FreeBSD Foundation libc copyrights

As per the updated FreeBSD copyright template. These were unambiguous
cases where the Foundation was the only listed copyright h

Remove "All Rights Reserved" from FreeBSD Foundation libc copyrights

As per the updated FreeBSD copyright template. These were unambiguous
cases where the Foundation was the only listed copyright holder.

Sponsored by: The FreeBSD Foundation

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Clarify bindat/connectat use with AT_FDCWD

Discovered during investigation into the PR - the description of
AT_FDCWD was somewhat confusing.

PR: 222632
Submitted by: Jan Kokemüller <jan.kokemuelle

Clarify bindat/connectat use with AT_FDCWD

Discovered during investigation into the PR - the description of
AT_FDCWD was somewhat confusing.

PR: 222632
Submitted by: Jan Kokemüller <jan.kokemueller@gmail.com>
MFC after: 1 week

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use .Mt to mark up email addresses consistently (part4)

PR: 191174
Submitted by: Franco Fichtner <franco at lastsummer.de>

- Implement two new system calls:

int bindat(int fd, int s, const struct sockaddr *addr, socklen_t addrlen);
int connectat(int fd, int s, const struct sockaddr *name, socklen_t namelen);

which

- Implement two new system calls:

int bindat(int fd, int s, const struct sockaddr *addr, socklen_t addrlen);
int connectat(int fd, int s, const struct sockaddr *name, socklen_t namelen);

which allow to bind and connect respectively to a UNIX domain socket with a
path relative to the directory associated with the given file descriptor 'fd'.

- Add manual pages for the new syscalls.

- Make the new syscalls available for processes in capability mode sandbox.

- Add capability rights CAP_BINDAT and CAP_CONNECTAT that has to be present on
the directory descriptor for the syscalls to work.

- Update audit(4) to support those two new syscalls and to handle path
in sockaddr_un structure relative to the given directory descriptor.

- Update procstat(1) to recognize the new capability rights.

- Document the new capability rights in cap_rights_limit(2).

Sponsored by: The FreeBSD Foundation
Discussed with: rwatson, jilles, kib, des

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