Add documentation for ds-identify configuration

Bug #1838092 reported by Dan Watkins on 2019-07-26
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This bug affects 1 person
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cloud-init
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Bug Description

When working through bug 1837927, I had to go read the header (and actual source code) of ds-identify to determine what the correct configuration to apply was. We should include the ds-identify configuration options in the regular cloud-init documentation.

Scott Moser (smoser) wrote :

In bug 1837927, the right way to tell cloud-init that it should only look for the Ec2 datasource is to do configure the 'datasource_list'.

I'm not vehemently opposed to documentation of it, but did not document
originally because:
a.) complicates things if you ever need to change that doc (because now you have to say 'if you have version X')
b.) pins us to that documentation.
c.) configuration of ds-identy really should not be needed. It is an
implementation detail of cloud-init. Documentation of something that you don't want people to have to know about (or to change the behavior of) is not necessarily a good thing.

You're welcome to disagree and provide documenation, but lack of it is at least
*somewhat* by design.

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