Refactor Datastores to allow future improvements. OpenTSDB Tags. (#11283)

* 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

* Make sure port data is stored the same way as before for Graphite and OpenTSDB
Add ifIndex tag to all to be compatible

* Missed rrdtool_tune() call

* Test update WIP

* OpenTSDB now includes tags

* fix style

config/app.php

@@ -180,6 +180,7 @@ return [
         App\Providers\RouteServiceProvider::class,
         App\Providers\ComposerServiceProvider::class,
         App\Providers\ViewServiceProvider::class,
+        App\Providers\DatastoreServiceProvider::class,
 
         /*
          * LibreNMS Service Providers...
@@ -241,6 +242,7 @@ return [
         // LibreNMS
         'Permissions' => \App\Facades\Permissions::class,
         'DeviceCache' => \App\Facades\DeviceCache::class,
+        'Rrd' => App\Facades\Rrd::class,
     ],
 
 ];