This story covers all the needed work from the code side that needs to be done to support the 3.5 ignition spec.

To support 3.5 we need to, from a high level perspective:

• Bump the ignition dependency to v2.20.0, that contains the 3.5 types.
• Switch all imports that points to 3.4 to point to 
  github.com/coreos/ignition/v2/config/v3_4/types.
• Create the conversion logic and update the existing ones:

• • convertIgnition34to22 changes to convertIgnition35to22
  • convertIgnition22to34 changes to convertIgnition22to35
  • create convertIgnition35to34
• Update UTs to reflect above changes and to cover the new function.

Done When:

• The code points to the new ignition release
• The code uses ignition 3.5 as the default version
• The UT tests are updated to match the changes for the already existing code plus the new conversion functions