inspect-builder does not represent optionality of buildpacks within groups.

[nebhale]

Currently when pack inspect-builder is run, it lists the buildpacks in a group, but does not describe their optionality.

  Group #1:
    org.cloudfoundry.openjdk@latest
    org.cloudfoundry.buildsystem@latest
    io.projectriff.java@latest
    org.cloudfoundry.azureapplicationinsights@latest
    org.cloudfoundry.debug@latest
    org.cloudfoundry.googlestackdriver@latest
    org.cloudfoundry.jmx@latest
    org.cloudfoundry.procfile@latest

represented by

[[groups]]
labels = [ "java", "riff" ]
buildpacks = [
  { id = "org.cloudfoundry.openjdk",                  version = "latest" },
  { id = "org.cloudfoundry.buildsystem",              version = "latest", optional = true },
  { id = "io.projectriff.java",                       version = "latest" },

  { id = "org.cloudfoundry.azureapplicationinsights", version = "latest", optional = true },
  { id = "org.cloudfoundry.debug",                    version = "latest", optional = true },
  { id = "org.cloudfoundry.googlestackdriver",        version = "latest", optional = true },
  { id = "org.cloudfoundry.jmx",                      version = "latest", optional = true },

  { id = "org.cloudfoundry.procfile",                 version = "latest", optional = true },
]

The optionality of the buildpacks in each group should be represented in the output.

[mgibson1121]

After speaking w/ @djoyahoy, we're holding off on testing this until optionality can be reflected when running pack inspect-builder on the builders a user sees when they run pack suggest-builders. Although I can build mock builders and see the functionality of this story is implemented, seems that the real value isn't there until we can deliver on what I mention in the last sentence

[mgibson1121]

Disregard my above comment, optionality shows up with remote builders, but the suggested builders don't have optionality. Accepting this story.

[ekcasey]

done on master will ship in v0.2.0