fix(jinja): avoid non-backward compatible yaml rendering

[noelmcloughlin]

Make formula compatible with salt 2019.2

ID: lvm packages installed
    Function: pkg.installed
        Name: u'lvm2'
      Result: False
     Comment: Problem encountered installing package(s). Additional info follows:

              errors:
                  - Running scope as unit: run-r7f6ca1091b2e4917b1973ef8df4ece07.scope
                    E: Unable to locate package u'lvm2'
     Started: 15:38:45.062402
    Duration: 2609.399 ms
     Changes:
----------
          ID: lvm packages installed
    Function: pkg.installed
        Name: u'cryptsetup'
      Result: False
     Comment: Problem encountered installing package(s). Additional info follows:

              errors:
                  - Running scope as unit: run-rd014f96d38ac48299d5431c57baa8d80.scope
                    E: Unable to locate package u'cryptsetup'
     Started: 15:38:47.672018
    Duration: 515.26 ms
     Changes:

[myii]

Thanks @noelmcloughlin, merged.