Updating the `create_files` stanza does not rebuild the test

[smehta99]

Going from this:

    create_files:
      'test_dir/test.txt':
      - 'line 1'
      - 'line 2'
      - 'line 3'
      - 'line 4'

to this:

    create_files:
      'test.txt':
      - 'line 1'
      - 'line 2'
      - 'line 3'
      - 'line 4'
      - 'line 5'

does not re-generate the file in the correct location or update the existing file. I had to rebuilt the test by passing -r to pavilion command. Seems like updates to the create_files: stanza doesn't force rebuild the test like the other portions of the build stanza does.