Refactor ec2 startup script (potentially into a new project into a scripting language)

[evansiroky]

Observed behavior

When deploying to an ELB instance, at least the 2 following items could be improved:

1. The download of all assets for the bundle occurs on the datatools-server instance and then needs to be uploaded to s3 and then downloaded again to the graph-building instance.
2. There isn't great error reporting in the user data startup script. IE, if something fails, the failure reason can't be immediately be derived.

Expected behavior

1. The graph-building instance could create the bundle instead to decrease the amount of time it takes to wait for the bundle to be uploaded and then downloaded.
2. It may be best to have a separate project that has a startup script that can be downloaded onto the ec2 instance and then perform all of the startup tasks.

Steps to reproduce the problem

n/a

Any special notes on configuration used

A datatools-server with ec2 deployments enabled.

Version of datatools-server and datatools-ui if applicable (exact commit hash or branch name)

f49d482