[MINOR] K-means seeded fix
[MINOR] K-means seeded fix

This commit change the seeding of k-means to actually work.
Since the last change to add the seed, unfortunately, made each initial
cluster assign to the same location, making the entire selection and
sampling in the beginning invalid.
Now the seed are incremented and different for each of the initial values.

apache/incubator-systemml,apache/incubator-systemml,apache/incubator-systemml,apache/incubator-systemml,apache/incubator-systemml,apache/incubator-systemml