postgres: Make logging a bit nicer

roles/postgres/templates/postgresql.conf.j2

@@ -341,7 +341,7 @@ dynamic_shared_memory_type = posix	# the default is the first option
 
 # - Where to Log -
 
-#log_destination = 'stderr'		# Valid values are combinations of
+log_destination = 'syslog'		# Valid values are combinations of
 					# stderr, csvlog, syslog, and eventlog,
 					# depending on platform.  csvlog
 					# requires logging_collector to be on.
@@ -376,8 +376,8 @@ dynamic_shared_memory_type = posix	# the default is the first option
 # These are relevant when logging to syslog:
 #syslog_facility = 'LOCAL0'
 #syslog_ident = 'postgres'
-#syslog_sequence_numbers = on
-#syslog_split_messages = on
+syslog_sequence_numbers = off
+syslog_split_messages = off
 
 # This is only relevant when logging to eventlog (win32):
 # (change requires restart)
@@ -442,7 +442,7 @@ dynamic_shared_memory_type = posix	# the default is the first option
 #log_duration = off
 #log_error_verbosity = default		# terse, default, or verbose messages
 #log_hostname = off
-#log_line_prefix = '%m [%p] '		# special values:
+log_line_prefix = '%d: '		# special values:
 					#   %a = application name
 					#   %u = user name
 					#   %d = database name