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

includes/html/graphs/application/proxmox_traffic.inc.php

@@ -18,7 +18,7 @@
 
 require 'includes/html/graphs/common.inc.php';
 
-$proxmox_rrd = proxmox_rrd_name($vars['cluster'], $vars['vmid'], $vars['port']);
+$proxmox_rrd = Rrd::proxmoxName($vars['cluster'], $vars['vmid'], $vars['port']);
 
 if (rrdtool_check_rrd_exists($proxmox_rrd)) {
     $rrd_filename = $proxmox_rrd;