Corrupt 'spark-log4j-properties' for Spark service

It seems like the 'spark-log4j-properties' configuration passed from Ambari | Services | Spark | Configs is getting corrupt and reformatted into one line without LF. The log4j config file is getting compressed into a field, with all LF characters dropped out. This configuration apparently cannot be changed into normal/standard multi line configuration that would be meaningful to Spark.
This way it seems like the whole log4j configuration is being ignored completely. If not due to the syntactical sanity, then at least due to the first character is '#', which applies to the whole line. The default Spark loglevel is set to INFO, so consequently console prints whole number of INFO messages for each statement passed to the console. Consequently further, the loglevel cannot be changed to WARN or ERROR and INFO lines cannot be suppressed from the console.

--> The log4j.properties.template configuration looks like this:

1. Set everything to be logged to the console
   log4j.rootCategory=INFO, console
   log4j.appender.console=org.apache.log4j.ConsoleAppender
   log4j.appender.console.target=System.err
   log4j.appender.console.layout=org.apache.log4j.PatternLayout
   log4j.appender.console.layout.ConversionPattern=%d {yy/MM/dd HH:mm:ss}

   %p %c

   {1}: %m%n
   
   # Settings to quiet third party logs that are too verbose
   log4j.logger.org.eclipse.jetty=WARN
   log4j.logger.org.eclipse.jetty.util.component.AbstractLifeCycle=ERROR
   log4j.logger.org.apache.spark.repl.SparkIMain$exprTyper=INFO
   log4j.logger.org.apache.spark.repl.SparkILoop$SparkILoopInterpreter=INFO
   
   --> The log4j.properties configuration looks like this:
   
   # Set everything to be logged to the consolelog4j.rootCategory=WARN, consolelog4j.appender.console=org.apache.log4j.ConsoleAppenderlog4j.appender.console.target=System.errlog4j.appender.console.layout=org.apache.log4j.PatternLayoutlog4j.appender.console.layout.ConversionPattern=%d{yy/MM/dd HH:mm:ss} %p %c{1}

   : %m%n# Settings to quiet third party logs that are too verboselog4j.logger.org.eclipse.jetty=WARNlog4j.logger.org.eclipse.jetty.util.component.AbstractLifeCycle=ERRORlog4j.logger.org.apache.spark.repl.SparkIMain$exprTyper=INFOlog4j.logger.org.apache.spark.repl.SparkILoop$SparkILoopInterpreter=INFO

--> This issue leads to the ### INFO messages that log4j prints in Spark console, without possibility to change the loglevel:

[root@sandbox ~]# spark-shell --master yarn-client --driver-memory 512m --executor-memory 512m
log4j:WARN No appenders could be found for logger (org.apache.hadoop.metrics2.lib.MutableMetricsFactory).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
Using Spark's default log4j profile: org/apache/spark/log4j-defaults.properties
15/11/05 12:34:41 INFO SecurityManager: Changing view acls to: root
15/11/05 12:34:41 INFO SecurityManager: Changing modify acls to: root
15/11/05 12:34:41 INFO SecurityManager: SecurityManager: authentication disabled; ui acls disabled; users with view permissions: Set(root); users with modify permissions: Set(root)
15/11/05 12:34:41 INFO HttpServer: Starting HTTP Server
15/11/05 12:34:41 INFO Server: jetty-8.y.z-SNAPSHOT
15/11/05 12:34:41 INFO AbstractConnector: Started SocketConnector@0.0.0.0:54564
15/11/05 12:34:41 INFO Utils: Successfully started service 'HTTP class server' on port 54564.
Welcome to
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/__/ ./_,// //_\ version 1.3.1
/_/

Using Scala version 2.10.4 (OpenJDK 64-Bit Server VM, Java 1.7.0_85)
Type in expressions to have them evaluated.
Type :help for more information.
15/11/05 12:34:44 INFO SparkContext: Running Spark version 1.3.1
15/11/05 12:34:44 INFO SecurityManager: Changing view acls to: root
15/11/05 12:34:44 INFO SecurityManager: Changing modify acls to: root
15/11/05 12:34:44 INFO SecurityManager: SecurityManager: authentication disabled; ui acls disabled; users with view permissions: Set(root); users with modify permissions: Set(root)
15/11/05 12:34:44 INFO Slf4jLogger: Slf4jLogger started
15/11/05 12:34:44 INFO Remoting: Starting remoting
15/11/05 12:34:44 INFO Remoting: Remoting started; listening on addresses :[akka.tcp://sparkDriver@sandbox.hortonworks.com:35020]
15/11/05 12:34:44 INFO Utils: Successfully started service 'sparkDriver' on port 35020.
15/11/05 12:34:44 INFO SparkEnv: Registering MapOutputTracker
15/11/05 12:34:44 INFO SparkEnv: Registering BlockManagerMaster
15/11/05 12:34:44 INFO DiskBlockManager: Created local directory at /tmp/spark-3b14e9fc-73b1-45e7-96f3-f0ee48f3a238/blockmgr-ffd0619a-5fbc-4ccc-bcef-ce8560e03cd7
15/11/05 12:34:44 INFO MemoryStore: MemoryStore started with capacity 265.4 MB
15/11/05 12:34:45 INFO HttpFileServer: HTTP File server directory is /tmp/spark-7648f575-a8e3-4b25-945f-b4ded8631592/httpd-ec5526bb-4de6-42d6-83aa-a1ba0a2ca5dd
15/11/05 12:34:45 INFO HttpServer: Starting HTTP Server
15/11/05 12:34:45 INFO Server: jetty-8.y.z-SNAPSHOT
15/11/05 12:34:45 INFO AbstractConnector: Started SocketConnector@0.0.0.0:58853
15/11/05 12:34:45 INFO Utils: Successfully started service 'HTTP file server' on port 58853.
15/11/05 12:34:45 INFO SparkEnv: Registering OutputCommitCoordinator
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