Remove infra database from Sneaky Pete.

Since we have conductor, there's no need for the infra
database to be passed around everywhere.
Clean up create_backup RPC

Some parameters were unnecessary and have been removed.
Changed up sender

Now the JSON structure is enforced and the call sites
are able to be strongly typed to JSON at compile time
and look prettier.
Merge pull request #20 from TimSimpsonR/no-more-dbs

Remove infra database from Sneaky Pete.