[SPARK-4628][BUILD] Remove all non-Maven-Central repositories from build #10659
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This patch removes all non-Maven-central repositories from Spark's build, thereby avoiding any risk of future build-breaks due to us accidentally depending on an artifact which is not present in an immutable public Maven repository.
I tested this by running
inside of a fresh Ubuntu Docker container with no Ivy or Maven caches (I did a similar test for SBT).