nutcracker: move config in puppet, work with new packages

We are both moving the twemproxy config in puppet, and making the puppet
class work correctly with the new package, where we repackaged nutcracker with
its proper name and with saner defaults and init scripts directly in the
package.

This config can be deployed using tagged runs as well.

This change depends on 143892 being deployed in scap.

Change-Id: I42ee37f1431388e9659c2f44e334ac8db67fd2b3
Signed-off-by: Giuseppe Lavagetto <glavagetto@wikimedia.org>