Bump stager

Bump cloudfoundry-incubator/stager:
  Ted Young:
     Move guard into handler ( Travis Unknown )
     refactor outbox tests for clarity ( Travis Unknown )
Merge remote-tracking branch 'origin/develop' into develop
add submodule automation scripts
add smoke tests

also expanded rewrite_package_specs to cover test dependencies (opt-in),
and synced all submodule configs

[#77576622]
bump auctioneer to fix flaky tests
stop modifying apt sources in pipeline image
default to running all unit tests
consolidate unit test scripts
skip cf-test-helpers
Bump runtime-metrics-server, fly

Bump cloudfoundry-incubator/runtime-metrics-server:
  Alex Suraci:
     fix flaky integration test ( Travis created: https://travis-ci.org/cloudfoundry-incubator/runtime-metrics-server/builds/35661073 )
Bump concourse/fly:
  Alex Suraci:
     woops, fix inverse check
     use git ls-files to determine files to upload
  Amit Kumar Gupta:
     Support insecure SSL connections with -k flag
     go fmt ./...
add scripts/run_inigo, which executes via fly

passes -x so that the large .gitignored files are excluded

[#78292980]
unit test scripts forward cli args
add instructions for running inigo

[#78292980]
inline scripts/drone-test from inigo
Update nats client to use yagnats apcera/nats wrapper [#76637390]

Signed-off-by: Amit Gupta <agupta@pivotallabs.com>
Vendor auction/simulation dependencies

Signed-off-by: Amit Gupta <agupta@pivotallabs.com>
Fix merge conflict with stager

Signed-off-by: Amit Gupta <agupta@pivotallabs.com>
rewrite run_unit for drone support

[#78964864]
fix paths in .drone.ymls
clean up go source artifacts from packages

[finishes #78971376]