Update admin-ui to latest version.

Hey, all. 

Recently I rolled to using latest admin-ui. I decided also to update this bosh release. 

The main problem was that admin-ui [started to use](https://github.com/cloudfoundry-incubator/admin-ui/blob/master/Gemfile#L9) `sequel_pg` that required `pg` gem. `pg` gem from its sided needed `libpq-dev` installed. As a quick solution I've decided to take it from [bosh release](https://github.com/cloudfoundry/bosh/tree/master/release/packages)  as @cppforlife suggested (many thanks to him).

Still this PR contains reference to bosh s3 blob store inside [config/final.yml](https://github.com/allomov/admin-ui-boshrelease/blob/6e254ef2c79231df907b80398d79515cf3dd076e/config/final.yml#L6) to resolve this issue quickly. @drnic I can update `admin-ui-boshrelease` bucket if I have API credentials (my email is lomov.as@gmail.com).