Add ci scripts for smoke tests [#77576622]

Signed-off-by: Matthew Sykes <matthew.sykes@gmail.com>
Bump converger, runtime-schema, gosub

Bump cloudfoundry-incubator/converger:
  Alex Suraci:
     backfill unit tests for lrp watcher metrics ( Travis Success: https://travis-ci.org/cloudfoundry-incubator/converger/builds/35998572 )
Bump cloudfoundry-incubator/runtime-schema:
  Alex Suraci:
     backfill lrp convergence tests [#76563354] ( Travis Success: https://travis-ci.org/cloudfoundry-incubator/runtime-schema/builds/35999081 )
Bump vito/gosub:
  Alex Suraci:
     remove only submodules we know to be gone
Fix run diego smoke tests script [#77576622]

Signed-off-by: Matthew Sykes <matthew.sykes@gmail.com>
unconditionally install gosub

installing is idempotent and only happens if it needs update
Create final release 0.418 for build 172