packaging: setup: improve dwhd service handling

The new implementation adds dwhd service to init levels
using chkconfig call, also updates the stopping/starting
it similar to engine and postgres services.

Change-Id: I8c31f2cc75a5f4805bd53da1ffc23c71cf856bc6
Bug-Url: https://bugzilla.redhat.com/1022550
Signed-off-by: Alex Lourie <alourie@redhat.com>