[cli] bosh help with non-existent command should alert [fixes #50911339]
prune old gems in ci_build.sh
excludes image so apply_spec.yml doesn't get missed
Forgot to make tar_options optional
Replaced s3cmd for candidate gems uploader to new FogBulkUploader

[fixes #50833679]
Change microbosh database user back to 'postgres'

[fixes #51075253]
store director UUID in database

previously director stored UUID in /var/vcap/store/director/state.json
now we store UUID in a director_attributes table in the director db

if the state file exists it will be used to populate the UUID
and then be removed

finishes [#50459173]
Log scheduler stdout in sandbox.
Fill in bat manifest template.

Allow it to be used to generate bat manifests outside of spec.
Extract AwsRegistry into its own file; retrofit spec
Avoid passing around instance state
Extract LightStemcell class from Ami
Shrink publish_ami.rb since it isn't run locally
Replace spec/publish_ami.rb with a rake task
Stop creating unused stemcell-ami.txt
Simplify light stemcell creation
Extract "publish to pipeline" to reuse for light stemcell
Internalize param that never changes and rename method
[openstack_cpi] Fail nicely if VM flavor does not have ephemeral disk [fixes #50904773]
[openstack_cpi] Use /dev/sd* convention for device names