Changing template mapping from int to integer

[ruflin]

In all our fields.yml files we use int to define integers. It seems the correct mapping type in elasticsearch is integer: https://www.elastic.co/guide/en/elasticsearch/reference/current/mapping-types.html We should rename all int to integer and regenerate our templates.

Note: This had not affect so far as we didn't generate the templates for int.

Example here:
https://github.com/elastic/beats/pull/1155/files/e5b256f2376efd752f23bec8c60dfff46eb2ba42#diff-8034c25c820cd3bb48fe68e5a463a9b3R100

[ruflin]

"type":"int" does not work on ES 1.7, 2.x and 5.0. We must change this for all beats.