(MODULES-6831) Capture / redirect install.ps1
(MODULES-6831) Capture / redirect install.ps1

 - The existing simplified installer produces stdout when it tries
   to execute `puppet service puppet` commands, and in a succesful
   scenario responds with:

   Notice: /Service[puppet]/ensure: ensure changed 'stopped' to 'running'
   service { 'puppet':
     ensure => 'running',
     enable => 'true',
   }
   Installation has completed.

 - This information pollutes the Bolt output stream, and prevents it
   from being able to properly parse the structured JSON output as
   JSON.

 - Return the actual script output in the "output" JSON field, using
   the JSON sanitization helper

 - Also note that ConvertTo-JsonString has been updated to replace
   low ASCII controls characters (00 - 1F) with spaces. Puppet output
   typically emits escape esquences (0x1B) for colorization, which
   breaks the ability of Bolt to parse JSON

puppetlabs/puppetlabs-bootstrap,puppetlabs/puppetlabs-bootstrap