Do not declare instance on check, rename url to host (#9646)
Do not declare instance on check, rename url to host (#9646)

* Do not resolve IP on __init__

* Do not declare instance on check, rename url to host
DataDog/integrations-core,DataDog/integrations-core,DataDog/integrations-core,DataDog/integrations-core,DataDog/integrations-core,DataDog/integrations-core,DataDog/integrations-core,DataDog/integrations-core,DataDog/integrations-core,DataDog/integrations-core