Render chef environment from base and specific template

Chef environment will be rendered from base template and the specific
template configured in adapter flavor config file. Base template contains
general configs for an adapter, whereas the specific template can
override/add configs according to different flavors of the adapters.

Change-Id: Id9caf6dc6513b5f11daad4b58a935948d80c691a
Merge "Render chef environment from base and specific template" into dev/experimental