Added retries to installation of nginx in integration specs
Added retries to installation of nginx in integration specs

The blob syncing is flaky. Tries 3 times.

[#98764200](https://www.pivotaltracker.com/story/show/98764200)

Signed-off-by: Tim Hausler <0e2fe13acea22d58959d12c030372eeff089f09b@pivotal.io>

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