Make persistent disk detection fail in case it doesn't come up in time. Added tests, cleaned up classes
Merge branch 'platform' of github.com:ankurcha/bosh into platform

* 'platform' of github.com:ankurcha/bosh:
  Add AWS bootstrap external spec for ELB configuration
  increase Bosh CLI refresh rate to 10s to reduce deploy output for CI test
  Add external AWS bootstrap CLI tests for security groups and DHCP option sets
  Renamed global_blobstore to compiled_package_cache
  get director debug log if we have a failure
  Adding ruby-version file