[7.x] add support for elasticsearch 7.x and remove support for 5.x (#558)

- add support for elasticsearch 7.x
- remove support for elasticsearch 5.x
- update kitchen-ansible configuration (install ansible and jmespath dependencies using os repositories)
- replace geoip plugin in tests as this one is now embeded in elasticsearch since 6.7.0 (cf. https://www.elastic.co/guide/en/elasticsearch/plugins/6.7/ingest-geoip.html)
- update discovery configuration for 7.x (in ES 7.x, discovery.zen.ping.unicast.hosts is replaced by discovery.seed_hosts and transport.tcp.port is replaced by transport.port, also discovery.seed_hosts is disabled on master nodes to avoid "master_not_discovered_exception" error when creating templates in the same play)
- update index template structure for 7.x 
- update security realms settings for 7.x (cf. https://www.elastic.co/guide/en/elasticsearch/reference/current/breaking-changes-7.0.html#include-realm-type-in-setting)

templates/jvm.options.j2

@@ -103,14 +103,6 @@
 #-XX:+UseGCLogFileRotation
 #-XX:NumberOfGCLogFiles=32
 #-XX:GCLogFileSize=128M
-
-# Elasticsearch 5.0.0 will throw an exception on unquoted field names in JSON.
-# If documents were already indexed with unquoted fields in a previous version
-# of Elasticsearch, some operations may throw errors.
-#
-# WARNING: This option will be removed in Elasticsearch 6.0.0 and is provided
-# only for migration purposes.
-#-Delasticsearch.json.allow_unquoted_field_names=true
 {% if es_jvm_custom_parameters !='' %}
 {% for item in es_jvm_custom_parameters %}
 {{ item }}