update hiera_xxx() to lookup() for hiera v5

[7yl4r]

Using hiera 5 requires using the lookup function in place of hiera_xxx() functions. (hiera lookup docs).

Without updating this, deep merging using hiera 5 is impossible with this module, but updating will break compatibility with hiera 3.

[7yl4r]

More specifically:

-  $_outputs = hiera_hash('telegraf::outputs', $outputs)
-  $_inputs = hiera_hash('telegraf::inputs', $inputs)

+  $_outputs = lookup({
+      name          => 'telegraf::outputs',
+      default_value => $outputs,
+  })
+  $_inputs = lookup({
+      name          => 'telegraf::inputs',
+      default_value => $inputs,
+   })

[jschaeff]

You can get this behaviour by adding the variable in your lookup_options;

--- # common.yaml
lookup_options:
  telegraf::inputs:
    merge:
      strategy: deep
      merge_hash_arrays: true

[trunet]

You can get this behaviour by adding the variable in your lookup_options;

hiera_hash is deprecated... lookup function needs to be used, doesn't matter the merge strategy

[yankcrime]

Fixed via #82.