Add support loggin conf for designate

Add support logging conf openstack_log_appender param
with fluentd and syslog log handlers

Change-Id: I621a8c7bb7221ee1aa1cbff04c26986a0e90a9d8
Related-Prod: PROD-19781
diff --git a/README.rst b/README.rst
index c07a44d..2ba22ba 100644
--- a/README.rst
+++ b/README.rst
@@ -146,6 +146,31 @@
               rndc_port: 953
               rndc_key_file: /etc/designate/rndc.key
 
+Enhanced logging with logging.conf
+----------------------------------
+
+By default logging.conf is disabled.
+
+That is possible to enable per-binary logging.conf with new variables:
+  * openstack_log_appender - set it to true to enable log_config_append for all OpenStack services;
+  * openstack_fluentd_handler_enabled - set to true to enable FluentHandler for all Openstack services.
+
+Only WatchedFileHandler and FluentHandler are available.
+
+Also it is possible to configure this with pillar:
+
+.. code-block:: yaml
+
+  designate:
+    server:
+      logging:
+        log_appender: true
+        log_handlers:
+          watchedfile:
+            enabled: true
+          fluentd:
+            enabled: true
+
 Usage
 =====