Add journal settings (#210)

* Added journal settings

* Fixed error:
    ----------
                 ID: package_duo
           Function: pkg.installed
               Name: duo-unix
             Result: False
            Comment: Problem encountered installing package(s). Additional info follows:
              errors:
                  - E: There were unauthenticated packages and -y was used without --allow-unauthenticated

* Removed 2016 system checks as it doesn't support path_join and added 2019 version checks

README.rst

               DefaultLimitCPU: 2
               DefaultLimitNPROC: 4
 
+Systemd journal settings:
+
+.. code-block:: yaml
+
+    linux:
+      system:
+        ...
+        systemd:
+          journal:
+            SystemMaxUse: "50M"
+            RuntimeMaxFiles: "100"
+            
 Ensure presence of directory:
 
 .. code-block:: yaml

linux/files/journal.conf

+{%- from "linux/map.jinja" import system with context -%}
+#This file is managed by salt
+[Journal]
+{%- for option, value in settings.items() %}
+{{ option }}={{ value }}
+{%- endfor -%}

linux/system/journal.sls

+{%- from "linux/map.jinja" import system with context %}
+{%- if system.enabled and grains.get('init', None) == 'systemd' %}
+
+{%- if system.systemd.journal is defined %}
+
+linux_systemd_journal_config:
+  file.managed:
+    - name: /etc/systemd/journald.conf.d/90-salt.conf
+    - source: salt://linux/files/journal.conf
+    - template: jinja
+    - makedirs: True
+    - defaults:
+        settings: {{ system.systemd.journal|tojson }}
+    - watch_in:
+      - module: linux_journal_systemd_reload
+
+linux_journal_systemd_reload:
+  module.wait:
+    - name: service.restart
+    - m_name: systemd-journald
+    - require:
+      - module: service.systemctl_reload
+
+{%- endif %}
+{%- endif %}

linux/system/systemd.sls

 {%- from "linux/map.jinja" import system with context %}
 {%- if system.enabled and grains.get('init', None) == 'systemd' %}
+{%- if system.systemd.journal is defined %}
+include: 
+  - linux.system.journal
+{%- endif %}
 
 {%- if system.systemd.system is defined %}
 linux_systemd_system_config:

tests/pillar/system.sls

         - host1
         - host2
         - .local
-
     # pillars for netconsole setup
     netconsole:
       enabled: true