Dadoo run sometimes exits before tests attach
Dadoo run sometimes exits before tests attach

Make attach wait time optional and increase duration 0.5s.

[#155814623]

Signed-off-by: Danail Branekov <43f82d874965b9fe2876a1a864fffde1e64d6143@gmail.com>

cloudfoundry-incubator/guardian,cloudfoundry-incubator/guardian,cloudfoundry-incubator/guardian