[SPARK-18547][core] Propagate I/O encryption key when executors register.#15981

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vanzin wants to merge 4 commits intoapache:masterfrom

vanzin:SPARK-18547

Commits on Nov 22, 2016

[SPARK-18547][core] Propagate I/O encryption key when executors register.
Marcelo Vanzin
committed
Fix mesos compilation.
Marcelo Vanzin
committed

Commits on Nov 28, 2016

Throw error from mesos code, update docs.
Marcelo Vanzin
committed

Commits on Nov 29, 2016

Add warning about RPC encryption being disabled.
Marcelo Vanzin
committed