Add official producer for csv?

[alswl]

Is this a BUG REPORT or FEATURE REQUEST?:

Uncomment only one, leave it on its own line:

/kind bug
/kind feature

What happened:

No producer for csv type.

What you expected to happen:

Provide a csv producer in service/content.go

How to reproduce it (as minimally and precisely as possible):

Anything else we need to know?: