[SPARK-2924] remove default args to overloaded methods

Not supported in Scala 2.11. Split them into separate methods instead.

Author: Anand Avati <avati@redhat.com>

Closes #1704 from avati/SPARK-1812-default-args and squashes the following commits:

3e3924a [Anand Avati] SPARK-1812: Add Mima excludes for the broken ABI
901dfc7 [Anand Avati] SPARK-1812: core - Fix overloaded methods with default arguments
07f00af [Anand Avati] SPARK-1812: streaming - Fix overloaded methods with default arguments
Revert "[SPARK-2468] Netty based block server / client module"

This reverts commit 3a8b68b7353fea50245686903b308fa9eb52cb51.
Merge remote-tracking branch 'apache_spark/master'