MB-9307: Use the partition versions from the on disk header

After a rollback the partition versions of the header it
was rolled back to must be used.

Also return the new partition versions on the 'ok'
response.

Change-Id: Ie0e8384da4f66cb76cb77eb6a93918416457da9a
Reviewed-on: http://review.couchbase.org/31296
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Filipe David Borba Manana <fdmanana@gmail.com>