Retry the gnatsd tests 3 times to account for intermittent failures
Retry the gnatsd tests 3 times to account for intermittent failures

[#150714777](https://www.pivotaltracker.com/story/show/150714777)

Signed-off-by: Dale Wick <188d987a4b971a1fecf708bf002a3b94c86c96a2@pivotal.io>

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