Add egress rules to staging and start messages to DEA

* Address rspec deprecation in app_stager_task_spec
* Add rspec-collection_matchers
* Change `be_false` to `be false`

[#71585132]

Signed-off-by: Zach Robinson <zrobinson@pivotallabs.com>
Signed-off-by: Julian Friedman <julz.friedman@uk.ibm.com>
Signed-off-by: Matthew Sykes <matthew.sykes@gmail.com>