feat: add victorialogs module (#374)

- add module for victorialogs
- add hieradata for vl insert/select/storage
- manage packages, directories, services, etc
- manage exporting metrics

Reviewed-on: #374

modules/victorialogs/templates/options.erb

@@ -0,0 +1,33 @@
+<%
+  opts = @options || {}
+  lines = []
+
+  def undefish?(v)
+    v.respond_to?(:strip) && v.strip.downcase == 'undef'
+  end
+
+  opts.each do |key, val|
+    flag = "-#{key}"
+
+    case val
+    when Array
+      need_bare = false
+      val.each do |v|
+        if undefish?(v)
+          need_bare = true
+        else
+          lines << "#{flag}=#{v}"
+        end
+      end
+      lines << flag if need_bare
+    else
+      if undefish?(val)
+        lines << flag
+      else
+        lines << "#{flag}=#{val}"
+      end
+    end
+  end
+%>
+OPTIONS="<%= lines.join(" \\\n  ") %>"
+

modules/victorialogs/templates/victorialogs.service.erb

@@ -0,0 +1,18 @@
+[Unit]
+Description=VictoriaMetrics vminsert service
+After=network.target
+
+[Service]
+Type=simple
+User=<%= @user %>
+Group=<%= @group %>
+Restart=always
+EnvironmentFile=<%= @vars_file %>
+ExecStart=<%= @exec_path %> $OPTIONS
+
+PrivateTmp=yes
+NoNewPrivileges=yes
+ProtectSystem=full
+
+[Install]
+WantedBy=multi-user.target