Added chef-server-schema component

Make sure to edit and rebase this to PUBLIC chef-server-schema.
Currently, the repo is locked.
Added chef-server-schema to chef-server project dep
Add sqitch upgrade to postgresql recipe
Added preflight upgrade to sqitch. Idempotently upgrade schema in reconfigure.

Right now, the idempotent upgrade will be a no-op if sqitch metadata is
not found in the schema. However, it will later fail on the bootstrap.
The no-op is how things currently work.
Update Gemfile.lock so latest omnnibus-software is pulled in

This pulls in the latest cert changes to the software can build without
needing to use the cached versions
Added sqitch upgrade during `chef-server-ctl upgrade`

- Install schema via sqitch if db is created.
- Add --verify to sqitch update