Add ansible provisioning (#122)

* first ansible skeleton

* first commit of ansible installation of vulnwhisperer outside docker

* first ansible skeleton

* first commit of ansible installation of vulnwhisperer outside docker

* refactor the ansible role a bit

* update readme, add fail validation step to provision.yml and fix
typo when calling a logging funciton

ansible/roles/elastic.elasticsearch/templates/elasticsearch.yml.j2

@@ -0,0 +1,75 @@
+
+{% if es_config %}
+{{ es_config | to_nice_yaml }}
+{% endif %}
+
+{% if es_config['cluster.name'] is not defined %}
+cluster.name: elasticsearch
+{% endif %}
+
+{% if es_config['node.name'] is not defined %}
+node.name: {{inventory_hostname}}-{{es_instance_name}}
+{% endif %}
+
+#################################### Paths ####################################
+
+# Path to directory containing configuration (this file and logging.yml):
+
+{% if (es_version | version_compare('6.0.0', '<')) %}
+path.conf: {{ conf_dir }}
+{% endif %}
+
+path.data: {{ data_dirs | array_to_str }}
+
+path.logs: {{ log_dir }}
+
+{% if es_path_repo is defined %}
+path.repo: {{ es_path_repo }}
+{% endif %}
+
+{% if es_action_auto_create_index == true %}
+action.auto_create_index: true
+{% elif not es_action_auto_create_index %}
+action.auto_create_index: false
+{% else %}
+action.auto_create_index: {{ es_action_auto_create_index }}
+{% endif %}
+
+{% if es_enable_xpack %}
+{% if not "security" in es_xpack_features %}
+xpack.security.enabled: false
+{% endif %}
+
+{% if not "monitoring" in es_xpack_features %}
+xpack.monitoring.enabled: false
+{% endif %}
+
+{% if not "alerting" in es_xpack_features %}
+xpack.watcher.enabled: false
+{% endif %}
+
+{% if not "ml" in es_xpack_features %}
+xpack.ml.enabled: false
+{% endif %}
+
+{% if not "graph" in es_xpack_features %}
+xpack.graph.enabled: false
+{% endif %}
+{% endif %}
+
+{% if es_mail_config is defined %}
+xpack.notification.email:
+  account:
+    {{ es_mail_config['account'] }}:
+      profile: {{ es_mail_config['profile'] }}
+      email_defaults:
+        from: {{ es_mail_config['from'] }}
+      smtp:
+        auth: {{ es_mail_config['require_auth'] }}
+        host: {{ es_mail_config['host'] }}
+        port: {{ es_mail_config['port'] }}
+        {% if es_mail_config['require_auth'] == true %}
+        user: {{ es_mail_config['user'] }}
+        password: {{ es_mail_config['pass'] }}
+        {% endif %}  
+{% endif %}