AMBARI-9768. ambari-server.log entries do not have date logged (aonishuk)

ambari-server/conf/unix/log4j.properties

@@ -26,7 +26,7 @@ log4j.appender.file.File=/var/log/ambari-server/ambari-server.log
 log4j.appender.file.MaxFileSize=80MB
 log4j.appender.file.MaxBackupIndex=60
 log4j.appender.file.layout=org.apache.log4j.PatternLayout
-log4j.appender.file.layout.ConversionPattern=%d{ABSOLUTE} %5p [%t] %c{1}:%L - %m%n
+log4j.appender.file.layout.ConversionPattern=%d{DATE} %5p [%t] %c{1}:%L - %m%n
 
 # Log config changes
 log4j.logger.configchange=INFO,configchange