* refactor: OS Discovery cleanup (Part 1)
Convert linux.inc.php to use new string functions
Create OS discovery tests
Use glob instead of readdir in os discovery (could change discovery order)
Stop discovering once $os is set
* Remove duplicate file header.
Move the classloader to as early as possible in defaults.inc.php
This should cover all application entrances.
Set install_dir based on the location of defaults.inc.php
* Prepare for dual rrdtool processes
Disabled at this time
Split out rrdtool version checks into rrdtool_create_command()
Tests for rrdtool_create_command()
Fixes a few small issues.
* Enable dual process and remote rrd check/creation
* remove full path for remote commands
* Doc updates
minor fix to rrdtool_tune()
* Set up bootstrap for phpunit
Fix issues with FileExistsException
* Attempt to fix phpunit
* Fix classloader and bootstrap to use full paths only (not depending on $config)
* Fix phpunit tests, config.php does not exist.
