BUG/MEDIUM: local log format regression.

Since 2.3 default local log format always adds hostame field.
This behavior change was due to log/sink re-work, because according
to rfc3164 the hostname field is mandatory.

This patch re-introduce a legacy "local" format which is analog
to rfc3164 but with hostname stripped. This is the new
default if logs are generated by haproxy.

To stay compliant with previous configurations, the option
"log-send-hostname" acts as if the default format is switched
to rfc3164.

This patch addresses the github issue #963

This patch should be backported in branches >= 2.3.
diff --git a/doc/configuration.txt b/doc/configuration.txt
index 5996407..5eef1ff 100644
--- a/doc/configuration.txt
+++ b/doc/configuration.txt
@@ -1279,7 +1279,12 @@
   <format> is the log format used when generating syslog messages. It may be
            one of the following :
 
-    rfc3164   The RFC3164 syslog message format. This is the default.
+    local     Analog to rfc3164 syslog message format except that hostname
+              field is stripped. This is the default.
+              Note: option "log-send-hostname" switches the default to
+              rfc3164.
+
+    rfc3164   The RFC3164 syslog message format.
               (https://tools.ietf.org/html/rfc3164)
 
     rfc5424   The RFC5424 syslog message format.
@@ -2927,13 +2932,18 @@
               The PID, process name and system name are omitted. This is
               designed to be used with a local log server.
 
+      local   Analog to rfc3164 syslog message format except that hostname
+              field is stripped. This is the default.
+              Note: option "log-send-hostname" switches the default to
+              rfc3164.
+
       raw     A message containing only the text. The level, PID, date, time,
               process name and system name are omitted. This is designed to be
               used in containers or during development, where the severity
               only depends on the file descriptor used (stdout/stderr). This
               is the default.
 
-      rfc3164 The RFC3164 syslog message format. This is the default.
+      rfc3164 The RFC3164 syslog message format.
               (https://tools.ietf.org/html/rfc3164)
 
       rfc5424 The RFC5424 syslog message format.
@@ -7175,7 +7185,12 @@
     <format> is the log format used when generating syslog messages. It may be
              one of the following :
 
-      rfc3164   The RFC3164 syslog message format. This is the default.
+      local     Analog to rfc3164 syslog message format except that hostname
+                field is stripped. This is the default.
+                Note: option "log-send-hostname" switches the default to
+                rfc3164.
+
+      rfc3164   The RFC3164 syslog message format.
                 (https://tools.ietf.org/html/rfc3164)
 
       rfc5424   The RFC5424 syslog message format.