Bug#876298: ITP: golang-github-nightlyone-lockfile -- Handle locking via pid files

["Martin Ferrari" <tincho@debian.org>]

Package: wnpp
Severity: wishlist
Owner: Martín Ferrari <tincho@debian.org>

* Package name    : golang-github-nightlyone-lockfile
  Version         : 0.0~git20170804.0.6a197d5-1
  Upstream Author : Ingo Oeser
* URL             : https://github.com/nightlyone/lockfile
* License         : Expat
  Programming Lang: Go
  Description     : Golang library to handle locking via pid files

 Package lockfile handles pid file based locking. While a sync.Mutex helps
 against concurrency issues within a single process, this package is designed
 to help against concurrency issues between cooperating processes or
 serializing multiple invocations of the same process. You can also combine
 sync.Mutex with Lockfile in order to serialize an action between different
 goroutines in a single program and also multiple invocations of this program.

This is a new dependency for prometheus 2.0.