change director log level to ERROR for integration test
change director log level to ERROR for integration test

[#129654195](https://www.pivotaltracker.com/story/show/129654195)

Signed-off-by: Ming Xiao <fde61075b779168f6585a9760a4f9e9e08423562@pivotal.io>

barthy1/bosh,barthy1/bosh,barthy1/bosh,barthy1/bosh