Don't emit staging output to loggregator

  * Since DEA logging agent is now listening to container sockets we don't need to emit them twice

[#63400876]
Fix flaky test: regenerate droplet sha1 in start message on every call

  * Starting message sometimes contained sha1 calculated before the app was staged.
This introduced flakiness in running_app_spec.
Newer versions of Vagrant are ok

Signed-off-by: Abhijit Hiremagalur <abhi@pivotallabs.com>
Update bcrypt to work with new heroku buildpack

[#63634414]

Signed-off-by: Michael Maximilien <maxim@us.ibm.com>
Assert that HTTP_PROXY is conveyed to staging env

[#63634414]

Signed-off-by: Michael Maximilien <maxim@us.ibm.com>
Update README.md

Must cd into the dea_ng directory before trying to submodule update.
Auto-merge remote-tracking branch 'upstream/master'