Update with non-bastion best practice.#50

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glenngillen wants to merge 3 commits intoaws-samples:masterfrom glenngillen:bastion-replacement

+619-22

Commits on Nov 26, 2018

Update docs with non-bastion best practice.
glenngillen
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Commits on Jan 4, 2019

Make bastion an optional component.
glenngillen
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Commits on Jan 11, 2019

Bastion gets into an unrecoverable state if we allow it to be created without keys.
glenngillen
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