enable http request timeout

Change-Id: Id1e2df59e54d0b062bd3322766615ab667955871
Signed-off-by: michael zhang <zhangcheng@rbcon.com>
Reviewed-on: http://reviews.cloudfoundry.org/13088
Tested-by: CI Master <cf-ci@rbcon.com>
Reviewed-by: Frank Lu <flu@vmware.com>
Reviewed-by: Pin Xie <pxie@vmware.com>