Fix TFBuildProvider.IsHostedAgent for Azure Pipelines
Fix TFBuildProvider.IsHostedAgent for Azure Pipelines

Sam13/cake,robgha01/cake,gep13/cake,cake-build/cake,robgha01/cake,patriksvensson/cake,Sam13/cake,devlead/cake,gep13/cake,ferventcoder/cake,patriksvensson/cake,mholo65/cake,ferventcoder/cake,mholo65/cake,devlead/cake,cake-build/cake