Fix generator files (elastic#3621)

There were some changes in the structure of some files, and this is
needed to update the generator as well.

Part of elastic#3159.
(cherry picked from commit 87b0618)

filebeat/scripts/module/fileset/config/config.yml

@@ -1,9 +1,6 @@
-- input_type: log
-  paths:
-  {%- for path in paths %}
-   - {{path}}
-  {%- endfor %}
-  exclude_files: [".gz$"]
-  fields:
-    source_type: {module}-{fileset}
-    pipeline_id: {{beat.pipeline_id}}
+input_type: log
+paths:
+{{ range $i, $path := .paths }}
+ - {{$path}}
+{{ end }}
+exclude_files: [".gz$"]

filebeat/scripts/module/fileset/manifest.yml

@@ -1,14 +1,13 @@
 module_version: 1.0
 
-vars:
-  paths:
+var:
+  - name: paths
     default:
-      - /example/path*
+      - /example/test.log*
     os.darwin:
-      - /usr/local/example/path*
+      - /usr/local/example/test.log*
     os.windows:
-      - "c:/example/path*"
+      - c:/programdata/example/logs/test.log*
 
 ingest_pipeline: ingest/pipeline.json
-prospectors:
-  - config/{fileset}.yml
+prospectors: config/{fileset}.yml