add new field for overriding default timeout
add new field for overriding default timeout

[#82445524]

Signed-off-by: Daniel Lavine <5ca8f6c726ce2120d02818e3c4896f90201eef24@us.ibm.com>

cloudfoundry-incubator/cf-test-helpers,nttlabs/cf-test-helpers,nttlabs/cf-test-helpers,cloudfoundry-incubator/cf-test-helpers