Refactor datastores to classes (#9179)

* Datastores to object oriented code, using the Laravel IoC container

Change instantiation
better DI
move OpenTSDB

Small re-orgs

remove unused stuff

Fix graphs and other scripts

Use DI for all except rrd

fix up connection error handling

Add tests, fix up a "few" things
Add Config::forget()

Style fixes

Don't reference legacy code

remove accidental code paste

Add datastores phpunit groups

some tests

* rebase fixes

* some test fixes

* shorter tests

* shorter tests

* Don't except when rrdtool can't be started.

* restore tests

* fix rrd tests

* fix iterable change upstream

* fix isValidDataset

* fix invalid data bug

* fix mysql incorrect ds

* fix issue with data that is too long

* use regular data_update()

* Use log facade

* OpenTSDB mis-ordered arguments fix

* Making a singleton with different options makes different singletons.  Just use the global config settings to disable datastores.

* only filter tags for datastores that won't it don't modify the tags permanently

* Update copyrights to include original authors.

* Stats for all datastores

* Fix mysql sends different rrd / other ds names

* fix snmp last stats not initialized
remove unused function

* remove unused function and move single use function closer to its use

* InfluxDB does not need to update null or U values.
Skip write if all fields are empty

* Fix smart value checks

* fix style issues

html/graph.php

@@ -9,6 +9,9 @@
  * @copyright  (C) 2006 - 2012 Adam Armstrong
  */
 
+use LibreNMS\Authentication\LegacyAuth;
+use LibreNMS\Data\Store\Datastore;
+
 $start = microtime(true);
 
 $init_modules = array('web', 'graphs', 'auth');
@@ -22,11 +25,9 @@ if (!$auth) {
 
 set_debug(isset($_GET['debug']));
 
-rrdtool_initialize(false);
-
 require \LibreNMS\Config::get('install_dir') . '/includes/html/graphs/graph.inc.php';
 
-rrdtool_close();
+Datastore::terminate();
 
 if ($debug) {
     echo '<br />';