CompilationDir filter doesn't support arrays or hashes

[masterzen]

Description of problem

When using parameters values that are arrays containing references to the compilation dir (ie using $::settings::codedir for instance, the CompilationDir filter is unable to detect that some of the array or hash members are equivalent.

For instance the following resource:

service { 'puppetserver':
  ...
  subscribe => [File["${::settings::codedir}/hiera.yaml"], Package['hiera-eyaml']]
}

will produce the following diff:

  Service[puppetserver] =>
   parameters =>
     subscribe =>
      - ["File[/tmp/ocd-ipc-20180605-856-t3sswg/ocd-builddir-20180605-858-e8z4wo/hiera.yaml]", "Package[hiera-eyaml]"]
      + ["File[/tmp/ocd-ipc-20180605-856-t3sswg/ocd-builddir-20180605-861-awzqbm/hiera.yaml]", "Package[hiera-eyaml]"]

Command used and debugging output

octocatalog-diff  --fact-file /repo/ci/facts/ubuntu.yaml --from-fact-override "role=tower" --to-fact-override "role=tower" --bootstrap-environment "V=0,SSH_AUTH_SOCK=/ssh-agent/ssh-agent.sock" --compare-file-text --filters CompilationDir --display-detail-add --debug

Platform and version information

• Your OS: ubuntu 16.04
• Your Ruby version: 2.3.1
• Your version of Puppet: 5.5.0
• Your version of octocatalog-diff: 1.5.3

It would be great for the CompilationDir filter to traverse arrays or hashes and apply recursively itself before taking any decision.