set log level to error for nested-tests
set log level to error for nested-tests

Signed-off-by: George Lestaris <5b078698b599a7ef978072fd4d352344963003fe@pivotal.io>

luan/garden-linux-release,Pivotal-DataFabric/garden-linux-release,luan/garden-linux-release,luan/garden-linux-release,cloudfoundry-incubator/garden-linux-release,cloudfoundry-incubator/garden-linux-release,Pivotal-DataFabric/garden-linux-release,Pivotal-DataFabric/garden-linux-release,cloudfoundry-incubator/garden-linux-release,luan/garden-linux-release,cloudfoundry-incubator/garden-linux-release,Pivotal-DataFabric/garden-linux-release,cloudfoundry-incubator/garden-linux-release