The task should immediately start collecting the new metrics after a plugin is loaded that shares the same namespace

[IzabellaRaulin]

The scenario which presents that:
Step1: Load PluginA
Step2: Create/start Task1 with "intel/*"
=> Task1 is collecting all metrics from PluginA

Step3a: Load PluginB1
=> Task1 should immediately start collecting the new metrics from PluginB1
In current implementation (PR #803) the metrics are being collected only from pluginA

Step3b: Load PluginB2 which requires config
=> Task1 should immediately start collecting the new metrics from PluginB2, but Task1 does not contain any config for the pluginB2, so after 10 times not receiving the metrics from this plugin, the Task1 will fail (@jcooklin approved that the initial task which was valid isn’t now so it seems reasonable that it would fail)

[IzabellaRaulin]

Resolved among others by #1146