app-admin/collectd forked and bumped to v5.4.1

Changelog
=========
 * AMQP plugin: Add support for RabbitMQ 0.4.x to avoid compiler warnings.
   Thanks to Sebastian Harl for implementing this.

 * Apache / Network plugins: Improved initialization order hopefully
   resolved gcrypt initialization problems.

 * Aquaero plugin: The type used to submit fan utilization was fixed.
   Thanks to Alex Deymo for the patch.

 * cgroups plugin: A small memory leak was fixed. Checking the existence of
   a mount option without a value was fixed. More permissive parsing of the
   cpuacct.stats file fixes support for some versions of Linux. Thanks to
   Marc Fournier for bug reports and patches.

 * cURL plugin: Fix <Match> blocks without an instance. Thanks to Alexander
   Golovko for reporting and Sebastian Harl for fixing this.

 * cURL-JSON plugin: Potentially invalid memory access has been sanitized.
   Thanks to Jim Radford for his patch.

 * Interface plugin: Fix behavior under FreeBSD 10: Reporting of
   per-address statistics caused duplicate updates to the same metric.
   Thanks to demon / @trtrmitya for the patch.

 * Write Graphite plugin: Use TCP to connect to Graphite by default. The
   default changed from TCP to UDP between 5.3.1 and 5.4.0, which is a
   regression. Thanks to Marc Fournier for fixing this. Reconnect behavior
   was improved. Thanks to Michael Hart for his patch.

 * ZFS ARC plugin: Collect "allocated" and "stolen" on FreeBSD only.

Gentoo Improvements
===================
 * All files in $FILEDIR are now organized in $PVR subfolders.

 * New runscript

     * Uses the default start and stop function provided
       by Gentoo.

     * After starting the daemon s-s-d will now wait 1000ms and check if
       collectd is really running (--wait option).

     * Working "status" check.

     * Added {start,stop}_pre functions.

 * New service (conf.d) configuration

 * All used patches are now documentated.

 * Added a patch for <https://github.com/collectd/collectd/pull/553>.