libutil++: Add freebsd::pidfile wrapper class around struct pidfh

This class wraps the pidfile_* API from libutil. The destructor calls
pidfile_remove() when an object is destroyed. This class is

libutil++: Add freebsd::pidfile wrapper class around struct pidfh

This class wraps the pidfile_* API from libutil. The destructor calls
pidfile_remove() when an object is destroyed. This class is similar
to std::unique_ptr<> in that it retains exclusive ownership of the
pidfh object.

In addition to release and reset methods, write, close, and fileno
methods are provided as wrappers for pidfile_*.

Sponsored by: Chelsio Communications
Pull Request: https://github.com/freebsd/freebsd-src/pull/1794

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