expect config_server prop as null for fuzz tests
expect config_server prop as null for fuzz tests

[#119700369]
https://www.pivotaltracker.com/story/show/119700369

Signed-off-by: Saman Alvi <a99666c385ff8d52f85bf6d52848ed17df23a2c5@pivotal.io>

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