will add more notes as it is clearer... main tracking issue: integrations-dev/issues/389

What we know now:

• Any 'Agent' can be set up as a Fleet Server, so our Docker usage is acceptable, as is of course the standard Centos / Debian / UBI8 / other images
• Stand-alone Agent scenarios won't be modified to use Fleet Server, as they will communicate w ES direct still
  ... An Agent running as Fleet Server will or will not be still a regular 'Agent' as well?
• We could validate that Stand-Alone Agent cannot be setup as a Fleet Server
• I think we should build the expectation of using Fleet Server into the existing install scripts... need to think on this more.