[SPARK-23572][docs] Bring "security.md" up to date.#20742

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vanzin wants to merge 6 commits intoapache:masterfrom

vanzin:SPARK-23572

Commits on Mar 5, 2018

[SPARK-23572][docs] Bring "security.md" up to date.
Marcelo Vanzin
committed

Commits on Mar 6, 2018

Make filters text look better.
Marcelo Vanzin
committed
Revert change caused by build, add exclusion for jekyll garbage.
Marcelo Vanzin
committed

Commits on Mar 12, 2018

Feedback.
Marcelo Vanzin
committed

Commits on Mar 16, 2018

Move SHS security options to the security page.
Marcelo Vanzin
committed
Feedback.
Marcelo Vanzin
committed