Make seed of min hasher repeatable

[tsdeng]

Use index of hash function as the seed of murmur hash

Currently, in MinHash we use randomGenerator to generate seed for murmurHash.

We want stable/repeatable behavior, so that
As long as the user provide the same parameter for constructing the monoid, the hash functions should be consistent

[sritchie]

Was it a bug that this wasn't the way it worked before?

[azymnis]

Would it make sense to make the seed a param of the MinHasher constructor?

[ianoc]

@sritchie if the underling algo for the pusedo random numbers to scala changed then it would, otherwise it should be fine

[jnievelt]

Would it be better to make this a separate type to avoid breaking compatibility with data stored from the existing version?

[ianoc]

Sorry my bad, git foo on cmd line broke stuff and closed all of these

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✅ johnynek
❌ Sam Ritchie
❌ tsdeng

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