Log to sandbox log instead of STDOUT
Log to sandbox log instead of STDOUT

[#155538073](https://www.pivotaltracker.com/story/show/155538073)

Signed-off-by: Luan Santos <509a85c757dc22c0257f4655fb3fb682d42f965b@pivotal.io>

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