Implemented bootstrap option for chef extension

[siddheshwar-more]

Added changes to support -BootstrapOptions option for chef extension to send bootstrap config in JSON format.

EX: -BootstrapOptions '{"chef_node_name":"mynode", . . .}'

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[siddheshwar-more]

@stankovski Could you please merge this PR?
Thank you!

[markcowl]

@siddheshwar-more We are currently working on a release for //BUILD which is using our private repository, so we will not be releasing code out of this repo until late May. Would you prefer that I move this change into the private repo for the current release?

[siddheshwar-more]

@markcowl
Yes. If possible, you can include this changes in next release as we already published chef extension which has bootstrap options support.

[markcowl]

@siddheshwar-more This didn't make it in to the private release for build, but we cna take it for our late May release. We are merging private changes today and will take this up after that work is complete.

[markcowl]

@azuresdkci add to whitelist